And use a "bottom tap" unless you have plenty of room to get the tap well
through the hole.
Stan Mayhew
----- Original Message -----
From: "Carol and Oliver Filippi" <[EMAIL PROTECTED]>
To: "Multiple recipients of VACList" <[EMAIL PROTECTED]>
Sent: Friday, April 13, 2001 2:47 PM
Subject: [VAC] Re: Stripped threads and tapping aluminum
> Good point about tapping aluminum. There are a number of modern high tech
> (politically and EPA correct) cutting fluids . However, the old standby
> which works very well is plain old kerosene (diesel fuel would work too).
>
> Dr. J's suggestion of replacing the 8-32 with a 10-32 is a viable option.
> Be sure to use a sharp tap and cutting fluid to get a clean sharp thread
to
> avoid "tearing" the new threads. No point in cutting "partially stripped
> threads".
>
> Oliver Filippi
>
> ----- Original Message -----
> From: "Dr. Gerald N. Johnson, electrical engineer" <[EMAIL PROTECTED]>
> To: "Multiple recipients of VACList" <[EMAIL PROTECTED]>
> Sent: Friday, April 13, 2001 8:50 AM
> Subject: [VAC] Re: Stripped threads
>
>
> > McMaster-Carr (www.mcmaster.com) has Helicoil down to 2-56. The 8-32 kit
> > is $42.88. A 10-32 tap can be had for about $3, probably more at the
> > hardware store. When tapping in aluminum it is very important to back
> > the tap up and break off the chip every half turn or no longer than a
> > turn of the tap else it will pack the tap tight and practically weld it
> > to the aluminum. More taps are broken in aluminum than in steel.
> >
> > If you use Loctite be sure and use a weak grade so you can take the
> > handle off some time for lock repairs. Like grade 222.
> >
> > To make the handle more secure, install with the set screw and let the
> > setscrew mark the shaft. Then take the knob off an drill a shallow
> > dimple for the end of the set screw to rest in. The connection will be
> > much stronger than just friction from the set screw.
> >
> > Be sure to carry an allen wrench to fit the new set screw.
> >
> > There is a self locking set screw available with a nylon patch that
> > holds it in place. I don't where to get them without buying in quantity.
> > McMaster-Carr has them in boxes of 100 for about $20.
> >
> > Gerald J.
> >
> >
> >
> > To unsubscribe or to change to a daily Digest, please go to
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> >
> > If replying back to this message, please delete all the unnecessary
> original
> > text from your reply.
> >
> >
>
>
>
>
> To unsubscribe or to change to a daily Digest, please go to
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>
> If replying back to this message, please delete all the unnecessary
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>
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