14xx episode 7 - turning tyres pt2
Lots of pictures here, they make more sense than my ramblings, so I will just stick to a few comments for each one, I must stress this is not the perfect/best way of tackling this job, but it works for me with the tools I have. For those who are interested I used to have a Myford ML7 with DROs and I really miss them, they are especially useful for this sort of job.
If you have any questions fire away.
The essential measuring tools, I have two 2-3 inch micrometers to save adjusting them for dimensions. both were bought off ebay for under a tenner. you can also see my working drawing prepared in 'crap-o-cad'
All tools prepared adjusted for height and ready
Loctite for attaching the tyre to the rim, I apply a small amount to the scrap piece before applying it to the rim with a cocktail stick as I don't want any foreign matter entering the bottle
These diamond sticks are handy if you need to quickly hone a tool
I use a 2inch DTI to measure the cross slide travel, this is very accurate and you don't have to worry about backlash. Really a poor mans DRO
The center glued into the 'tyre', if you have bored accurately this is gentle push fit, do not use force the wheel will distort
The bar is turned to the OD of the flange in this case 1.450"
The tread is then cut in, I don't bother with the taper as it is very slight and the form tool will remove the excess to make the taper.
I used a parting tool to turn a recess to clear the back of the form tool, otherwise the form tool is cutting the waste from the back of the tread, the form tool shot should make this clear.
The form tool ready to cut, I line this up with the face of the tyre and move it .193" inwards this gives the correct tyre width for GWR locos of .133"
Everything is locked up, the tread is blued with a felt tip and the form tool fed in firmly but slowly, the work is rotating at 40rpm, even then there is a small amount of chatter present.
The tread is formed and given a light polish, ready for parting off
Job done, just the rear of the wheel to be cleaned after parting. there is a little extra on the top flange but this will come off in the final polish when it's mounted on the axles.
Only three more to do:lol:
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