Why did you stone the key, far better to enlarge the depth of the keyway in the gear. File will do but broach would be better

If you can't ream them to the size you need then bore them on the lathe

Plastic. Gears are hyfroscopic. They will easily overcome ereee these tolerances. From new, better to be

A slip filt than a prick. In a shirt sleeve

.
it fit thdab me a bag in. a

Makes as much sense as Jason's reply to an invisible question

Ian P

I have a feeling that someone with fat fingers may have deleted the first post by accident as well as typing gibberish and double posting it to boot

The problem is that us moderators see another line below each post and "edit" is next to "delete" so easy to click the wrong one and the software does not ask you to confirm the deletion or have an option to retain deleted postings so they can be reinstated. Add in the fact that JS may have been posting via his phone and mistakes can happen.

Edited By JasonB on 28/07/2017 20:33:27

I think I can guess what this is about;…….

Mini-lathes are made by two different Chinese factories, at least as far as the lathes that come to to the UK are concerned. These are 'Sieg' and 'Real Bull'. Although the lathes are essentially the same design there are some detail differences, one of which is the change wheels. Internal diameter is the same but the key-way cut-out causes a problem if you wish to fit Sieg wheels on a Real Bull machine.

You need to enlarge the key-way slot 1mm wider to fit and the best way that i have found is to carefully cut the sides of the slot away using a scalpel, while repeatedly trying for a fit…… The wheels are made of a 'delrin' type of material and abrasive methods are tricky and difficult so firm cuts are needed. Once you have done a wheel it gets much easier to do.

The only source of wheels i could find in UK for my Real Bull lathe (Chester Conquest) was Arceurotrade who only have the Seig wheels.

Yes, the change wheels are quite a tight fit but CAN be 'urged' onto the studs!….it helps to lightly chamfer the inside edge of the wheel bores. The key-way slots are the same height for both makes of wheel but the width is considerably different.

……Probably because there's a difference in the perception of 'fit' between the Chinese production engineers and a model engineer living in the UK…… the wheels DO fit, albeit with some persuasion, provided you use either the right make of wheel or some 'remedial'…….

Larry,

I am sure the changewheels that Arceurotrade sell do fit the Seig machines they sell, if they do not you can complain.

But if you try them on a Real Bull you takes your choice. Bit like trying to mend a BMW with VW parts!!

As Dick Dastardly would say "Give me a translation Zilly…"

"Real Bull went bankrupt about 5 years ago. The result was the better sets saw light under the real bull logo and the rest sold by the second cousin on Ali Express."

John, I think you are meant to use your finger not your nose… and maybe switch auto-replace off

Neil