broken myford changewheel

I'm fitting ELS to my Myford 254S, and so I need a spindle encoder. The obvious place to mount a tooth belt is the shaft which drives the change-wheels, which is the standard Myford arrangement. Rather than having to make a slotting attachment to machine keyway, does anyone have a change-wheel with missing teeth which they would be prepared to part with? I could then turn it down and loctite the tooth belt pulley on.

I know I could do it with a boring tool sideways on by racking the saddle back and to, but I'm lazy!

Edited By duncan webster on 29/06/2019 17:21:48

Could you use a Taper-Loc bush if feasible to machine the pulley to suit? I think they are made down to that sort of diameter.

Don't you have a whole pile of unused gears now that you are fitting an ELS that you could use?

File a slot with a square file.

neil

Actually, just bore a blank oversize, make a brass top hat bush slotted to suit the key (easy job) and fit it in place using retainer.

I did this to fix a damaged changewheel and the repair lasted years, so for an unloaded encoder...

Neil

Drill a well placed hole and open it out & square it up with a file - hey presto - keyway!

Now that is a neat idea. As to using one of my now redundant change-wheels, I don't want to spoil a good one, you never know when you might need it

Don't you need it now???

Duncan -

My slotter is presently set up to cut the key ways in some myford changewheels I made, so if you would like to send me the blank I'll cut the keyway in it and post it back.

PM me if you are interested.

Rgds Simon

Rather than turing a gear down, use the slotted spacer (A2604) that is used in the gear train.

Bought a Clarkson about 15 years ago and done all my cutters on that, ends and flutes, it was a pain swapping setups over so last year purchased one of Arc Euros End mill grinders the EMG20, a superb piece of kit in my opinion, the Clarkson can now stay set up permanently for doing flutes. No connection to Arc, just a satisfied customer.

I've taken up Simon's very kind offer, but thanks for all the other suggestions

Thanks to Simon's efforts the encoder drive pulley has now been bored and keywayed. Attached photo shows it in position, the encoder mounting bracket is bolted to the gear-change quadrant. The belt is made of paper, just to get the right length, a real one is on its way! The paper one but I don't think it would last very long.