Temperature of Myford S7 headstock

[Dennis WAParticipant @denniswa]

How warm should the headstock (chuck end) get running at the higher speeds? My S7 gets warm to the touch at the chuck end – around 30 deg C measured with an IR thermometer. It is set up following the manual and using the Gospel according to Malcolm.

[Dennis WAParticipant @denniswa]

[egaParticipant @ega]

I mostly use the low range on my S7 but – excuse my ignorance – don't know which Malcolm you are referring to (is he a hot gospeller?)

I think it would help to know how long you run for before getting warm to the touch: the manual for a different lathe with taper roller bearings specifies an hours' running by when the housings should not be "too hot to the touch".

[Clive HartlandParticipant @clivehartland94829]

My ML10 chuck end bearing also gets warm at about the same temperature, I have a ball bearing spindle.

[HopperParticipant @hopper]

30 deg C is nothing to worry about. It's more like normal operating temp.

If it gets to where it is too hot to comfortably hold your hand on there for more than a few seconds, you probably have cause for concern.

If it's too hot to touch at all, you got problems for sure.

If it sizzles when you spit on it, the bearing is toast.

Edited By Hopper on 09/10/2017 01:18:21

[Dennis WAParticipant @denniswa]

Thanks for the answers.

It seems that, subject to your lubrication working, getting temperatures up to say 50 degrees C when working hard / at high speed are possible.

The trick is to feel how hot the headstock becomes when working under these conditions.

For the benefit of those who may not know, "the Gospel according to Malcolm" is the setting up procedure for the Myford Super 7 headstock & spindle assembly. Malcolm worked at the original Myford works in Beeston Rd.

[peak4Participant @peak4]

Posted by Dennis WA on 09/10/2017 13:41:55:

For the benefit of those who may not know, "the Gospel according to Malcolm" is the setting up procedure for the Myford Super 7 headstock & spindle assembly. Malcolm worked at the original Myford works in Beeston Rd.

Dennis, is it in writing anywhere?

I'm familiar with what's in the manual, but any first hand tips from one of the original engineers at Myford is always useful.

Thanks

Bill

[Dennis WAParticipant @denniswa]

Bill….Taken from this Forum, but I cannot find the post: apologies to the original poster(s).

The Gospel according to Malcolm (The original Myford works procedure)

1. Power Down

2. Remove all belt tension.

3. Remove Chuck

4. Rotate RH collar one complete turn. (top towards you).

5. Rotate LH collar one complete turn. (top towards you).

Spindle should be completely free of front bush.

6.Loosen allen screw on collar at end of spindle.

7. Using the Allen key tighten collar as tight at it will go by hand.

Inner tapered roller races are now locked together with correct pre-load.

8. Back off LH collar one complete turn + a bit (top away from you)

9. Rocking the spindle by holding the spindle nose tighten the RH collar by hand (top away from you).

10. When you feel resistance to movement stop.

11. Collar should be just tight enough that spindle can just be moved by hand holding the nose.

12. Do up the LH collar by hand (top towards you).

You should still feel resistance when turning the spindle by the nose.

13. With the crescent wrench on the LH collar tap the end smartly with a 12oz hammer.

The spindle should move forwards by a couple of tenths and be completely free running.

14. With the lathe running slowly (lowest direct speed) put the oil gun in the front oil cup and pump until oil issues from the front bearing.

15. All should be sweetness and light with great rejoicing in heaven and on the earth.

[Martin KyteParticipant @martinkyte99762]

I have to own up to caling it the Gospel. It did however come from Malcolm at Myfords Nottingham and is a description of the way they routinely set up headstocks in the works.

regards Martin

[egaParticipant @ega]

Dennis WA:

Thanks for identifying Malcolm and setting out his advice.

Presumably by "crescent wrench" he means C spanner.

[Dennis WAParticipant @denniswa]

"Presumably by "crescent wrench" he means C spanner."

That is what I thought. Martin can correct us if needed!

Cheers

Dennis

[Martin KyteParticipant @martinkyte99762]

Posted by ega on 09/10/2017 16:26:37:

Dennis WA:

Thanks for identifying Malcolm and setting out his advice.

Presumably by "crescent wrench" he means C spanner.

perzackterley.

Martin

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