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broken myford changewheel

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duncan webster29/06/2019 17:20:15
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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

Nigel Graham 229/06/2019 18:36:49
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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.

JasonB29/06/2019 18:48:56
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Don't you have a whole pile of unused gears now that you are fitting an ELS that you could use?

Neil Wyatt29/06/2019 19:03:57
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Posted by duncan webster on 29/06/2019 17:20:15:

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

File a slot with a square file.

neil

Neil Wyatt29/06/2019 19:14:23
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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

Nick Hulme29/06/2019 20:29:07
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Drill a well placed hole and open it out & square it up with a file - hey presto - keyway!

duncan webster29/06/2019 20:52:34
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Posted by Neil Wyatt on 29/06/2019 19:14:23:

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

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

Nicholas Wheeler 129/06/2019 21:43:17
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Posted by duncan webster on 29/06/2019 20:52:34:
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???

Simon Williams 329/06/2019 21:51:48
561 forum posts
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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

Nick Hughes30/06/2019 10:46:13
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243 forum posts
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Rather than turing a gear down, use the slotted spacer (A2604) that is used in the gear train.

Baz30/06/2019 10:57:18
524 forum posts
2 photos

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.

duncan webster30/06/2019 13:46:14
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2935 forum posts
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I've taken up Simon's very kind offer, but thanks for all the other suggestions

duncan webster10/07/2019 18:59:37
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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.

encoder 1 (small).jpg

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