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Myford chucks

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Mark Millward 111/06/2011 20:17:31
13 forum posts
How far should chucks go onto the spindle thread of an ML7 ? Put another way, how many turns is a minimum ? None of mine go fully on and all seems very clean.
Mark Millward
Clive Hartland11/06/2011 21:23:23
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2929 forum posts
41 photos
Mark, they should go right up to the face of the mandrel.
If they do not then re-clean the male and female threads and try again.
If you still have trouble then using a cotton wool bud apply a smear of blue on the male thread and plain part and see where it is catching.
I have noticed on my 3 jaw chuck some slight scrape marks inside the plain part of the chuck body as if someone has relieved the plain part!
I dont use any lubricant on my chuck threads at all. The only part I clean and lube is the scroll and jaw teeth. For this I use a stiff graphite grease.
Under no circumstance try and force the chuck onto the mandrel, it should go very easy if clean.
 
Clive
Tony Pratt 111/06/2011 21:24:58
2319 forum posts
13 photos
The chuck should screw on until the chuck register face meets the spindle register face, the threads shouldn't bind at all.
Tony
Chris Trice11/06/2011 22:53:27
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1376 forum posts
10 photos
Are the chuck bodies threaded or are they fitted to a backplate? If a chuck backplate has been machined too thin, the spindle nose can protrude through it and contact the rear face of the chuck body stopping it screwing fully home.
David Clark 112/06/2011 09:29:06
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3357 forum posts
112 photos
10 articles
Hi Mark
Take the chuck of the backplate.
Does the backplate go right up to the shoulder?
It should do.
regards David
Mark Millward 112/06/2011 22:45:16
13 forum posts
Thanks for your replies. I have spent ages cleaning the threads and things are getting easier. I believe a bit of aluminium swarf got in the thread and caused the binding. I should like to run a tap and die over the threads but they seem a bit expensive so will persevere with the wire brush and magnifying glass. Thanks again.
Mark
KWIL13/06/2011 09:36:28
3681 forum posts
70 photos
Mark,
 
You can make a thread cleaner for the backplate from a piece of piano wire, a long half loop with the ends turned outwards, with enough spring to push into the bottom of the threads, but not that much that it scratches the metal. I am not as keen as Clive on no lubricant, a trace of sewing machine oil should suffice. I have the taps but I do not suppose you are anywhere near.
Chris B13/06/2011 13:30:22
34 forum posts
5 photos
I used a 4" nail bent into an L shape, the point gets into the root of the thread and will displace any swarf when you run it round the thread.
The Merry Miller13/06/2011 16:50:08
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484 forum posts
97 photos
 
I use a small wooden backed brass wire brush that effectively screws itself into the thread and out the other side.
 
 

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