Member postings for Colin Seggie

Steve just replied to your pm.

Alastair

That does make complete sense now that I have had time to digest it I suppose where I went wrong was supposing you would use both and in truth you would only one or 'tother.

The knurling also makes sense as someone has knurled it exactly for the reason Steve describes.

Thanks

Mike I had not thought to as the part is not listed in the manuals

kwil- that is exactly how it works provided the thou ring is locked to the aluminuim disc but currently the disc just spins inside the thou ring. There needs to be some sort of friction fit between the aluminum disc and the thou ring this would then drive the smaller metric wheel. however, this cannot be a solid coupling as you would need to decouple the metric and English to set both to zero or for that matter to set the metric to zero. The only way I can see that happening is by siding the thou ring out away from the metric and disengage the planetry gears. Then to re engage you would slide the thou ring back in.

Jonathan

I understand where you are going with this but if the thou ring and aluminuim disc were fused then you would need to almost remove the locking nut just to get the thou ring teeth clear of the metric teeth. So that does not seem right. The missing fiducial was removed to gain a better view of the mechanism.

Thanks for your replies.

Edited By Colin Seggie on 18/10/2013 19:45:52

Hi All,

I have a Bridgeport R2E3 CNC mill, I realise that this is the Manual machine topic please bare with me all will become clear.

I am having a devil of a time getting any information on how the Dual dial that is used on the Knee works. What I can't figure out is how the English 100 thou ring engages with the aluminium disc that is pinched and held in place by the locking nut.

They say that a Picture is worth a 1000 words. I don't know how many words a rambling video is worth but this might make what I am asking clearer

Now the reason for asking in the Manual machine section is I have recently seen these dials on a manual machine, it was on a steam train shed tour in Aviemore and they were covered in oil, grease and soot so I could not see how they worked and the machinist was not in that day for me to ask.....(so close but yet so far) Also someone on another forum said he had the same on his manual mill years ago but that that machine was long gone.

I am guessing that there will be more owners of manual machines so that starts to tip the odds in my favour. It seems that these were only on UK machines and not used in the US.

Any help any one can offer is appreciated

Edited By Colin Seggie on 17/10/2013 21:45:26

Hi All

I am looking for a little help from those who have changed thier Spindle and spindle bearings to the new Myford supplied P bronze bearings and hardened Spindle. I have 2 issues that concern me.

1. The new spindle does not have a slot/half hole for the 25 tooth gear to accept the locking grubscrew. Am I correct in assuming i have to Drill and tap that myself? How is this best done? Do I install the gear and choose a new point and theen drill and tap leaving the old tapping? Is it best done with the spindle installed in the lathe, with a hand drill or out on the drill press?

2. I had to add 2 sheets of paper to all four points on the bearing journals that is over and above the Myford supplied shims which seems odd to me. Now on the front bearing (closed to the chuck) it seems to pump air in to the oil hole (in the bearing Journal) rather than it drain away through the bearing. What can be done to stop this?

Any help is apprieciated.

Alastair