[modeleng] Re: Damaged 4 jaw chuck
- From: "Terry Lane" <tel@xxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Sat, 18 Dec 2004 06:48:50 +1100
That may be the only solution open to you Dennis, and worth a try. After
all, if the chuck is THAT old, wot 'ave you got to lose?
----- Original Message -----
From: "Dennis Rayner" <dennis.rayner@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, December 18, 2004 5:19 AM
Subject: [modeleng] Re: Damaged 4 jaw chuck
> May I thank everyone who helped on this one - the situation is:
>
> All 4 jaws tighten at the point at which they would grip about 3"
diameter.
> I have dismantled the chuck (never would have known about the forks - many
> thanks)
> The jaws move in and out freely, but the screws all bind to a greater or
> lesser degree.
> Rolled on the surface plate or spun in the lathe, I can see that the
screws
> are bent.
> I suspect that when I overtightened they leaned away from the jaws bending
> in the process.
> I have spoken to the very helpful chap at Rotagrip to seek replacement
> screws but, since the chuck
> is almost as old as me, they are obsolete (like me!) The chuck is not a
> Burnard.
>
> How to straighten the screws?? Not easy and I am sure we are only talking
a
> few thou.
>
> Since the screws are of square thread form (0.125" pitch), I am minded to
> stone the crests of the threads
> until they run free in the chuck body. Not a Rolls Royce solution but then
> I'm not a Rolls Royce engineer.
>
> Can anyone see a major problem with this blacksmith type solution?
>
> Thanks again
> Dennis
>
>
> PS to Wilfried. I did try to buy myself a new chuck for Christmas from ARC
> but they are shut until Jan 5th.
> Also, two nights ago I was pipped in the last 30 seconds to one on eBay.
> Perhaps I was always meant to save the money
>
>
>
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>
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