Myford chuck security

Myford chuck security

This topic has 6 replies, 6 voices, and was last updated 13 November 2012 at 11:29 by Nobby.

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12 November 2012 at 18:40 #103495
Trevor Davies 2
Participant
@trevordavies2
Myford ML7R

When trying to use rear parting tool and running the motor in reverse I found that the chuck was unscrewing itself off the headstock spindle. When fitting the chuck I lock the spindle by engaging backgear and then with the chuck key tighten the chuck on its thread as much as possible by hand..

How do I stop this happening so I can use the rear toolpost parting tool?
Advert

12 November 2012 at 18:40 #6436
Trevor Davies 2
Participant
@trevordavies2
12 November 2012 at 18:47 #103496
blowlamp
Participant
@blowlamp
Mount the parting tool upside down and rotate in the usual direction.
12 November 2012 at 19:05 #103497
KWIL
Participant
@kwil
Please do not engage backgear, you may well end up with a broken gear.

Does the ML7R have a pin (like the Super7) on the left hand face of the headstock which engages with the step pulley for the purpose of locking the spindle?

I exhibited a simple device at Sandown MEX which prevents the chuck unscrewing and which may well appear in published form shortly.
12 November 2012 at 19:43 #103500
Brian Wood
Participant
@brianwood45127
The ML7R does have a pin as KWIL describes, use that instead of back gear, it is much more positive ion use.
13 November 2012 at 06:48 #103539
joegib
Participant
@joegib
You could always fit a chuck lock of the type discussed in this thread when running in reverse:

Chuck Lock by Woofity

Similar chuck locks were supplied for their screw-nose lathes by respected companies such as Schaublin so they're not gimcrack devices. This assumes, of course, that your chuck backplate has a spigot 'neck'.

Incidentally, Woofity's version is a little more elaborate than commercial versions. The latter were commonly a simple split collar with a single screw spanning the gap (the strain relief hole opposite the split is still required, though).

Joe

Edited By joegib on 13/11/2012 06:55:12
13 November 2012 at 11:29 #103550
Nobby
Participant
@nobby
Hi Trevor
As blowlamp says mount parting tool upside down

Nobby
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