broken myford changewheel

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broken myford changewheel

This topic has 13 replies, 9 voices, and was last updated 10 July 2019 at 18:59 by duncan webster 1.

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29 June 2019 at 17:20 #416745
duncan webster 1
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@duncanwebster1
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
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29 June 2019 at 17:20 #15235
duncan webster 1
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@duncanwebster1
29 June 2019 at 18:36 #416755
Nigel Graham 2
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@nigelgraham2
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.
29 June 2019 at 18:48 #416759
JasonB
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@jasonb
Don't you have a whole pile of unused gears now that you are fitting an ELS that you could use?
29 June 2019 at 19:03 #416761
Neil Wyatt
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@neilwyatt
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
29 June 2019 at 19:14 #416762
Neil Wyatt
Moderator
@neilwyatt
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
29 June 2019 at 20:29 #416781
Nick Hulme
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@nickhulme30114
Drill a well placed hole and open it out & square it up with a file – hey presto – keyway!
29 June 2019 at 20:52 #416785
duncan webster 1
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@duncanwebster1
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
29 June 2019 at 21:43 #416790
Nick Wheeler
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@nickwheeler
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???
29 June 2019 at 21:51 #416791
Simon Williams 3
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@simonwilliams3
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
30 June 2019 at 10:46 #416839
Nick Hughes
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@nickhughes97026
Rather than turing a gear down, use the slotted spacer (A2604) that is used in the gear train.
30 June 2019 at 10:57 #416840
Baz
Participant
@baz89810
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.
30 June 2019 at 13:46 #416862
duncan webster 1
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@duncanwebster1
I've taken up Simon's very kind offer, but thanks for all the other suggestions
10 July 2019 at 18:59 #418219
duncan webster 1
Participant
@duncanwebster1
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.
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