Wells Index Serial #20567 Model 810

  1. Wells Index Serial #20567 Model 810
    1. Wells machine Specifications
    1. Pendant
    2. Motherboard
      1. Mesa cards (Looks like mesa is the deal?)
    3. Linuxcnc - see linuxcnc
    4. Scales (linear encoders)
    5. Spindle
      1. Spindle motor
      2. Hitachi WJ200-022SF inverter
        1.  WJ200-022SF Settings
      3. Spindle encoder
    6. Drive DC supply
    7. Homing Notes
    8. Servo motors
      1. Distance between pinon gear base and motor base:
      2. Gear ratio
      3. 2 are IIC Inc. MT30U4-36 (M4-2959A) - now all 3
      4. The other Milltronics MT30U4-38 -Spindle
      5. Encoders on the motors: dynamics research corp encoder 152-021-500-18UJ
    9. Lubes
    10. Way covers
    11. Tramming the nodd
    12. Kwik-Switch - on the tapers page
    13. Ball-screws
      1. Saddle and table ball-screw bearings
      2. Z-axis ball screw
    14. Spindle
    15. Sandwich Assembly
      1. Important things not to be missed
        1. Adjusting the end-play
      2. BACK GEAR - not really - does not reverse!
      3. Removal of 3hp Spindle motor
      4. Procedure for removing sandwich assembly for replacing oil seal in back gear housing and other repairs.
      5. Reassembly of gear box
      6. Removinge motor variable drive pulley spring assembly
      7. To remove vertical spindle pulley (drive cone pulley - CAM housing)
      8. Assembling Cam housing
      9. Brake
      10.  Spindle speeds
      11. Motor magnetic brake
      12. Bearings
    16. Size Weight
    17. Moving
    18. History
    19. Removing The Table
    20. Ram (AKA Overarm)
    21. Turret
  2. wiring
  3. Notes for similar machine
      1. INSTRUCTIONS FOR CHANGING SPINDLES IN THE FOLLOWING MODELS 745. 747. 756, 757, 845, 847, 856, 857,760, 860, and 887.
      2. PROCEDURE FOR FREEING UP BACK GEAR TO DIRECT DRIVE 745, 756, 760, 845, 856, 747, 757, 860, 847, and 857
    1. Precision limit switches

Wells machine Specifications

Table size 228x 1168mm [9" x 46"] 5/8" T-slots


Original color ASA 49 grey


VistaCNC http://www.vistacnc.com/b07_pendant_P1/pendant_p1A.htm


HP8300 -CMT ( have docs)

Mesa cards (Looks like mesa is the deal?)


"Anything I/O" does not meant what it says - only digital signals.

Linuxcnc - see linuxcnc

Scales (linear encoders)

SINO - have install manual

Need 3 scales
X KA300-720(1um)(RS422) Ali-ex $134.75 need length = 677 - extra 45mm
Y KA300-370(1um) Ali-ex 124.12 ???? need length =350 - extra 20mm existing mount holes 470
Z KA200-140 (1um) Ali-ex $195.86 need length = spec=132(wrong) actual 136

Aston Machinery Equipment Store?

All 9pin - Can you put together a package quote?

KA-200 supporting plate

KA300 supporting plate

KA300D enclosure or X

Guangzhou Lokshun CNC Equipment Ltd.
Address: No. 17, Yunjun Road, Huangpu District, Guangzhou
Postal code: 510530
Tel: +86-020-66839300 
Fax: +86-020-66839301


Spindle motor

Model 10348-BL1964E      Frame  AFA-912S

3-phase 60hz  3 HP

Max Ambient 50 - Continuous duty cycle.

Insulation code F (155°C - motor surface temp is 30° cooler - so max surface is 125°C )

RPM (@60hz) 1800

Insulation System B (130°C )

230V - 9.*A

460V 4.9A

Hitachi WJ200-022SF inverter


Max baud 15,200

Brake resistor 35 - 100ohms 400Watt?

W -H - D 108 128 170.5 Needs 100mm top and bottom clearance and 50 mm sides..
Power in 30A
power Wire - MTW or UL1015 https://www.houwire.com/products/belden.asp/ https://www.distributorwire.com/blog/machine-tool-wire/

 WJ200-022SF Settings

The manual is seriously sub-optimal - Hitachi should be embarrassed

PTC - settings

C005 - set 19  - ONLY if you have a 3k trip PTC thermistor in place.

C085 - 93%

C085 sets scale factor for PTC - works backwards - 150 trips at a lower resistance..
100% - trips at 3.19K 
90% trips at 3.52K (10% higher)

KTY81/222 thermistor is 2k-2.04K @25°C with a TC of 0.79%/°K

Temp to Resistance KTY81/222
°C R
20 1941
25 2020
30 2100
40 2267
50 2441
60 2623
70 2812
80 3009
90 3214
100 3426
110 3643
120 3855
125 3955
130 4048
140 4208
150 4323

Main settings :

b037 04 unlocks params
A001 03 Freq-source = ModBus input
A002 03 Run command source = ModBuss

A003 60 Base frequency- motor rated frequency where we have max torque and HP
A004 66 MAX freqiency - give a bit of head room.

A051      DC braking
A082 230 motor voltage AVR

C071 10 modbus baud rate 115,200
C072 01 ModBus addr
C074 00 No parity
C075 01 Stop bit
C076 01 Communication error = decelerates and trips
C077 00.0 Com error timeout 0 = disabled
C078 00 Com wait time - how long before reply

L terminal to deteSet 19 in C005.

H003  2.2  (2.2 or 3.7 ? ) KW rating of motor - ( could increase )
H004 04 Motor poles

P012 ???

F002 03  acceleration time sec
F003 03 deceleration time sec

b082 0.5 in hz  Start frequency

Important to run the auto-tuning on the motor, ideally with the belt off or in neutral drive position. (One can do a static autotune if it isn't possible to disengage the drive)

set A001 02
set A002 02
set F001 60
Verify H003 motor size in kwh
verify H004 motor poles
verify A003 base frequency - (motor frequency)
verify A082 AVR voltage - motor voltage
verify A051 00 is off for tuning DC braking

H001 02  - Enabled with motor rotation
Press RUN -  The motor will hum and then cycle up to 75% of speed twice. When completed the display will s
_ _ _  o - completed or _ _ _ _ Failed
Press stop
Set H002 02
- set the VFD run to stop and then press the reset key on the VFD.
Go into the programming mode and set H002 = 02 and save, this will load the motor auto tuning data.

Restore A001 A002 to 03

# lose all settings warning !!!!!!!!!!!!!!!
Factory reboot
Set B087 = 2

Might need some of below - don't think so - see manual

A039 = 04 jog stop controlled deceleration
# A042 = 5.0
# A044 = 03 this will give you full torque at low hertz.
A051 = 01 Enable DC braking
A052 = .25 freq DC braking starts
A054 = 60%
A061 = 60hz.
A062 = 8 hz.

B settings

B012 = Full load amperage on motor name plate.... mine is 8.6
B022 = 16.5 refer to page 59 of the quick ref. guide for the formula
B038 = 201
B090 = 10.0 -
B095 = 02
B097 = set to 35
B130 = 01
B133 = 1.0
B134 = 5.0

F settings

F002 = .55 acceleration time
F003 = .75 deceleration time

Spindle encoder

https://pico-systems.com/bridge_spindle.html  Used ATS667LSG sensors
high speed = 22 counts = 1 rev or  154 counts = 7-revs
low speed = 248.857 counts = 1 rev or 1742 counts =7 revs

Drive DC supply

Voltage was 72V - 80Vac

Transformer NMI-1179 secondary 62, 86, 90Vac ...1750VA?? national-meter.??  - 127V peak

Capacitors 2 - in parrellel 8700uf@150Vdc  - measure size..

Homing Notes

On a mill - home is typically with z all the way up, the saddle out towards the operator and the table all the way to the right ( z ends up over the back left corner of the table).

Servo motors

Distance between pinon gear base and motor base:

Z -  5.736mm
x -

Gear ratio

16 tooth drive gear - 32 count ball gear - 2:1 1000 counts per rev - 1 turn = .2" or .0002" or .005 08mm

Ball screws are 0.200" per turn - if instead we use 508 counts --1016 per rev -
.2" = 5.08mm thus one count would be 5um
with 5080 counts - one count would be 1um

2 are IIC Inc. MT30U4-36 (M4-2959A) - now all 3

40inlb stall torque
max RPM 4000
volts 114
Current at peak torque 75A
Continuous stall current 13.2A
max voltage - 140
Tacho 7 ??

The other Milltronics MT30U4-38 -Spindle

26 inlb stall torque 3Nm
Voltse ggradient no load 38V/kRPM
max RPM 3700
volts 140
Amps 45
Tacho 7 ??
Continuous stall current 8.6A
IP 44 (peak current??)
IC 40 (continuous current??)

Encoders on the motors: dynamics research corp encoder 152-021-500-18UJ

Look to be 500 per rev
Possible new replacement https://www.rls.si/eng/products/rotary-magnetic-encoders/re36-rotary-magnetic-shaft-encode

1270 is divisible by 254 as is 508,762,1016,1524 - Such a resolver should read metric direct - not available..Lubrication System and Tubing Parker NNR-3-039

needs connector with sleeve -- brass insert 63PT-3-25
Compression - Inch 3 68C-3-2

Compress-Align 3 68CA-3-2 (nut and sleeve only 61CA-3 ) pipe nut is 0.375 (3/8")


Mobil Grease 28 - spindle ball bearings and ballscrew - thrust ball bearings - think of this as ball bearing grease
Lithium grease - Mobilux EP 2 Bevel gears, spindle spline - not in manual

The ways, outer  spindle shaft calls for  Mobil vactra #2 via lube system - hand apply to ram bearings  - this is the same as any ISO 68 slide-way or way oil.

The sandwich Assembly Gearbox calls for Shell X-100 S.A.E. 10 W this is obviously not at all optimal - for several reasons. It is an old obsolete engine oil - and this is a transmission. Engine oils are for extreme environments, controlling combustion materials etc.   Looking back - it appears this was specified based on what other machines used all of which goes back to the 1930's where they needed something that would basically work and was readily available.  This machine had 5 yokes worn out that came with it.  They specified SAE 10 - which is about ISO32 - perhaps because the main shaft can turn at 4200 rpm for hours at a time? 
Looks like Mobil SHC 624 ISOVG32 would be much better..   Capacity is about 0.75l

Way covers

Important note - there are both 10-32 and 10-24 screw threads in these machines - the way wipers use 10-24.

Tramming the nodd

Possibly with moglice and a copper crush ?

Kwik-Switch - on the tapers page

Number stamped on spindle - 807-01


Saddle and table ball-screw bearings

Saddle and table ball screw bearings are MM9308WI 2H DUH
DUH means "Duplex Universal-heavy preload for precision bearings."
Duplex Angular Contact Bearing - Face to Face, 40 mm Bore, 62 mm OD, 1.2500 in Width, 60 ° Contact Angle, C0, Open

885-007-002  Ball screw bearing set $618.75 (too much)

The shims = 50mills - varies

The  Nilos Rings (dustcover/shields)

886-001-00006  seal  $54.20  (058-010-150 ??)

885-001-007  seal   $56.50    (058-010-151 ??)

Collar Threaded B300-010n

Z-axis ball screw

Shims = 30 mills (not proper color code)
Duplex Bearings are FAFNIR MM9306WI-2 mounted face to face.
The other end is a torrington J-1210 that I'm replacing with a Koyo.
The box that this is mounted in has 2 dowel pins that were MISSING! Could be there is enough slop that they should be? (poor quality?)
The ballscrew for Z says NSK Japan W3202W-2LP-upz  9nx-040


Change to a # 30 taper spindle??
According to Wells-Index   "The spindle taper is not grind-able as it has to be a specific depth in relation to the nut that holds the tool in so you have to grind it deep and then build it back up with hard chrome and then grind it again to the correct depth. This is doable but the hard chrome starts flaking off after a while. We have tried this before and the results were not satisfactory. If the spindle taper is bad the spindle has to be replaced with a new spindle and the bearings also need to be replaced. If you do not have any tooling I would suggest replacing it with a #30 taper spindle [probably means a BT30 taper] as this is a better spindle with tooling readily available from us and other companies. The #30 can also be touched up by ID grinding later in the machines life. " 

So I'm not sure the above is totally true?  There is always some tolerance in these systems - there must be some tolerance - the taper of the cams of the tool-holder nut would consume some amount of touch up?  Will measure it when I have it apart next.
There is a snap ring at the top of the spindle.

 where the Z ball screw attaches spindle was stamped "E15"

The kwik-Switch holder says:  (starts with an small u or upside down bell mark) 805043 Kwik-Switch II PAT 3829109 -- part number of "Master Spindle Nut Assembly"

Looking down the top of the spindle - there is a snap-ring holding a bearing - on the outer ring says "3007 Germany 1.13"
Inner ring - "6007ZR FAG"

Sandwich Assembly

This was an interesting design - no problem with back gear reversal - but some things are not so good - and some notes are critical. 

Sandwich Assembly(thumbnail)

Important things not to be missed

First, the 'back gear housing' (ref-98) was made of cast aluminum - while the belt guard housing(ref-63) was cast iron. This difference in metal - or perhaps just machining slop ended up with the recommendation to NOT use the dowel pins. Instead, (with everything upside down for gearbox assembly) before tightening the 8 bolts that hold things together - put a mag-base on the shaft and sweep the bottom of the gear-housing - shifting slightly (pry with screwdriver in dowel holes) until it is running as true as possible.  (obviously quite fiddly for a machine tool set up ).  The drawing HAS dowel pins - so I would first assemble with pull dowels and remove only if needed to get the drive shaft to run true.

The total head is aligned to the mill with a floating procedure - it is not pinned!

Fork assembly - put a mag base and indicator on the pulley shaft and indicate the brass fork to be parallel to the end of the shaft by rotating the shaft while the indicator is touching the yoke where the shift gear rides. Needs to be within .005”

Adjusting the end-play

Very important to under stand the stack-up or end-play of the main shaft!  There are two end play numbers - first the main shaft - "The end-play or stack-up clearances are 305um- 356um [.008" - .012"] when assembled" .  Realize that 'speed adjuster cam' (ref 14) sets the vertical of the pulley shaft (ref 28) - it is trapped against 'retaining cap'(ref 12) which is against 'Cam housing' (ref 17) which is mounted to the 'belt guard' (ref 63).  A shim between the last 2 references can raise the shaft.

The height of the  'drive gear shaft' (ref 80) - is set by the combination of the 'bronze washer' (ref 79) and the two turcite washers and boss gear (ref 82 & 85). Important to have the lower turcite washer (ref 85) in the grove of the boss gear before reassembly. The 'drive gear shaft ' is constrained at the bottom where the turcite washer meets the 'back gear housing' - there should not be a groove.

Measuring end-play:
Assemble the gears with everything upside down.  Put an indicator on the end of the shaft and lift to measure play. 

A Shim in-between Speed Adjuster Retaining Cap ref-12 and cam-housing (ref-17) increases end-play.  A shim in-between Speed Adjuster Retaining Cap ref-12 and Speed Adjuster Cam ref-14 reduces end-play.

Remember to true the drive shaft to the bottom of the gear housing by mounting an indicator on the shaft and sweeping the bottom of gear housing (98) an indicator..

This leaves the back gear assembly - that has a 1/4 hole that holds a ball bearing to limit clearance to the fan housing -- > might be better to come up with a thrust washer?

BACK GEAR - not really - does not reverse!

 (See Drawing #101-212-204)
The back gear lever (shift lever #100-002-900 ref(71)) is located on the upper left side of the head. The lever has 3 positions; high, low, and neutral. In the high (out) position, spindle drive is geared directly from spindle pulley to spindles (dog clutch #100-002-991 is in up position, in contact with drive cone pulley hub #100-002-999). In the low (in) position, spindle drive is geared through back gear #100-002-985 (dog
clutch #100-002-991 is in down position, back gear #100-002-991 is in mesh with back gear #100-004-557),

NOTE: 2 When shifting from neutral to high or low, turn spindle by hand while pushing back gear lever into position. This allows gears to line up in low speed and dog clutch to line up in high speed. When shifting into high it is imperative to have the spindle brake in the "brake on" position.  [YMMV - I've not had to put the brake on - just fiddle a bit]

Removal of 3hp Spindle motor

Procedure for removing sandwich assembly for replacing oil seal in back gear housing and other repairs.

Reassembly of gear box

To remove vertical spindle pulley (drive cone pulley - CAM housing)

Remove 6 socket head screws holding drive pulley cartridge(12) to pulley guard. (2 tapped holes (3/8"-16) provided in this part for jack screws)
Lift out drive pulley cartridge (containing drive cone pulley, spindle bearings and spindle bearing support). 

Assembling Cam housing



 Spindle speeds

 Back gear lever (high, low, or neutral).
On the variable speed drive head are even more readily changed by moving the  control lever from left to right or right to left with the spindle motor running
 and by shifting the back gear (high low or neutral).
CAUTION: Always be sure spindle motor is running before attempting to move variable speed adjustment lever.

Motor magnetic brake

Made by Reuland?


Model 29B2

Not going to use - takes 3ph - not worth it.


top to bottom - See sandwich spread sheet for details

13 - FAG 6009ZR (ZR = ONE METAL SHIELD, RADIAL TYPE) Bearing  (6009-2Z/C3 )

24 NSK 6012Z ( koyo )

32 JT51 ?? 60mm id 95 od 18mm  6012 size again - with seals. ???

78 INA (Schaeffler) - SCE228

84 J-2816

105 (2) B-1416

Looks like Torrington J-2016 C DHHH at the bottom..

Size Weight

ceiling height old shop
beams 83.5" 93" add 3" for south end
new shop
91.25" - beams 103" - top
machine with the motor removed? 84 Inches
Shipping weight for a CNC mill is 3700 lbs. 1680kg 16458Nthread5/8



Serial number 20567 (1980) Serial number 20567 is a USA made mill and shipped without a model number in November 1979 to a company in Texas who installed the control on it for the 1980 IMTS show in Chicago. Parts are still available for the mechanical part of the machine.

Removing The Table

Ball Screw Traveler and gib
Click to see details

Remove the gib adjustment screws on both end of the gib and then slide the gib out to the left.

There is also a stop piece on the bottom of the far right end of the table that needs to be removed with it's one bolt.


Table Stop
Click to see details

You need to remove the ball screw and table bracket on both ends and then the gib. . The ball screw can stay assembled with the left side table and motor bracket assembly. You can then slide the table out onto a cart

Rebuilding table - really good idea to seal the table so coolants can't get into the bearings..

Ram (AKA Overarm)

The back to front position of the head and overarm is readily changed by loosening the 2 hex nuts  on the end which clamp the overarm to the turret. Apply a crank to the overarm
adjustment shaft extension and move to desired position.


To index the entire turret-overarm-head assembly loosen the 4 inner hex nuts, 2 on either side of the overarm which clamp the turret to the top of the column. Then swing
the turret to the desired position and re-clamp.   The complete horizontal spindle, turret, overarm & arbor bearing may be positioned 30deg either side of normal horizontal milling position.

NOT E : It is highly recommended that all clamping nuts and bolts (turret to column, overarm to turret, head side-wise tilt and head forward-back tilt) be securely tightened before any machining cuts are taken. Always check these points before starting a cut. Also, when returning overarm to normal position, attach an indicator to the overarm, and slide the overarm in and out, with the indicator riding against a square, which has been squared to front of table to make sure overarm is square with table. (Why would anyone change this?)



(BNTECHGO) Or what they call continuous flex cables. (keywords Continuous-flex Cables high strand count)

Notes for similar machine

INSTRUCTIONS FOR CHANGING SPINDLES IN THE FOLLOWING MODELS 745. 747. 756, 757, 845, 847, 856, 857,760, 860, and 887.

  1. Remove drawbar if it has one.
  2. Drop knee and move saddle to rear so as to provide clearance for quill removal.
  3. Remove (100-027-771) adjustable vernier blade holder.
  4. Remove two 5/16-18 x 7/8 socket head cap screws in (100-002-917) quill feed trip key and remove key. Put right hand on (101 -212-312) spindle feed handle arm and left hand on the bottom of the quill, and by moving the (101-212-312) handle in a counter clockwise direction, run the quill down until the rack on the quill clears the pinion on the cross shaft.
  5. When this happens, the (101-212-312) hand lever will unwind very rapidly. If released, it could cause injury. So it must be unwound slowly.
  6. Let the quill slide down out of the head casting and put it in a vise, being sure to use brass or lead jaws in the vise.
  7. Release the locking ear of the W-07 lock washer in the N -07 locknut or snap ring in the top of the quill and remove nut from the spindle. (See Paragraph 11) See drawing
  8. Remove (100-002-972) front bearing retainer from quill after first releasing the 10/32 socket set screw in the lower rear of the quill. (NOTE: in the case of #30 MMT, the number is 100002-977.)
  9. Remove quill from the vise and strike spline or upper end of spindle against a solid piece of wood laying against a solid surface, such as the floor. The spindle and the two lower spindle bearings and spacers will then come out of the quill.
  10. Replace new spindle and assembly in reverse order making very sure that the N-07 locknut is tight enough so as to put tension on the 2968 spacer on serial number before approximately 17105 on R8 spindles and
  11. approximately 17360 on #9 B & S and #30 MMT spindles. After this serial number make sure the locknut is tight against the bearing.
  12. When putting the quill back into the head casting, first start the quill into the bore of the casting by gentle pressure and care (do not force).
  13. Line up the spline of the spindle with the spline of the (100-004-576) drive hub by turning the spindle after it goes up against the bottom of the (100-004-576) hub.
  14. Next, wind the 101-212-312 counter clockwise to the end of its spring tension and push quill up until the rack of the quill engages the pinion of the cross shaft and use (101-212-312) hand lever to raise quill up to
  15. the top of its travel.

PROCEDURE FOR FREEING UP BACK GEAR TO DIRECT DRIVE 745, 756, 760, 845, 856, 747, 757, 860, 847, and 857

This particular problem is usually caused by the (111-218-001) pulley guard being jolted out of line during shipment and can usually be remedied as follows:
  1. Shift the back gear lever into the direct drive (or High) and set the speed at about 1500 RPM.
  2. Loosen the eight 1/4-20 x 7/8 socket head cap screws which hold the (111-218-001) belt guard to the (111-218-212) assembly)
  3. Turn on the spindle motor, move the (111-218-001) belt guard a very slight distance in several directions. The dowel pin hole in the front of the pulley guard can be used with 1/4" allen wrench to move the pulley
  4. guard back and forth.
  5. The pulley guard will actually tend to center itself if reasonable care is exercised when retightening the eight socket heads that hold the belt guard to the back gear housing.

Precision limit switches

They have 3-5um at reasonable prices.

ditron DRO - via Stefan

houdaille taper???

model 3842 -- CEN 701 702 703 752 753 805 ???

lubriquip houdaille cleveland oh
model 120-003-521
timer model 163-400-000

motor IIC Inc MN 55344
30U4-36 S#H 19938

servo motor 2 Milltronic manufacturing

jog feed rate
Tool-change resume
feed- hold-pause

Stop drill
lockline coolant hose.. 1/4"


milling machine
servo dynamics corp 15 A module