[modeleng] Re: Locking a lathe spindle
- From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 2 Nov 2007 23:47:28 -0000
Hi chaps
Thanks for the suggestions as to how to positively lock the spindle on a
Myford. Perhaps I should have explained that I'm planing a keyway in a
wheel hub, and don't want the job to move while I'm doing it. The keyway
has to be in a certain position relative to the centre of the hub. I've set
the job up on a faceplate and clocked it to run true. Next, the spindle has
to be rotated to bring the keyway to the exact 9 o'clock position, as you
look towards the headstock, and locked at that precise position. By setting
the tool height accurately, I can then be sure that the keyway is cut true
to the axis of the job.
Anyway, back to the business of locking the spindle. I have actually used
Alan's suggested method, some years ago when I was cutting some spines on a
shaft, and indexing off the change gears. This was on an older lathe that I
had at the time. However, it doesn't solve my curent problem, nor does
Hubert's kind suggestion, with which I'm also familiar.
I have to thank John Pagett for his lateral thinking. It so happens that I
have a Myford spindle handle, but had never thought of using it the way John
describes. To give the handle something to clamp on to, I made a simple
timber device and clamped this across the top of the oil drip tray (my
Myford has the industrial type cabinet stand, which is quite easy to clamp
on to). The device is just a piece of 4 x 2 timber, a little longer than
the width of the oil tray, with a piece of 10mm plywood nailed on to form an
upstand. The handle is clamped on to this with a toolmakers clamp.
The result promises to be a success, thanks to John's brilliant idea.
Regards
Ron
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