Loctite Grade.

This topic has 7 replies, 5 voices, and was last updated 14 November 2013 at 18:28 by Gone Away.

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14 November 2013 at 09:47 #135496
Paul Barrett
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@paulbarrett57424
I am going to extend the leadscrew shaft of my VMC mill so I can fit a Bridgeport style feed motor. I will be drilling and reaming a hole in one end to insert the extension. Can anyone advise what grade of Loctite I should use to firmly attach it. I was going to make the extension a slide fit in the hole rather than a push fit so as not to get half way and it jams and also a small flat on the shaft to let the air out as it goes in.

Any comments?

Paul

Edited By Paul Barrett on 14/11/2013 09:49:07
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14 November 2013 at 09:47 #22952
Paul Barrett
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@paulbarrett57424
14 November 2013 at 10:11 #135497
Michael Gilligan
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@michaelgilligan61133
Paul,

638 Retainer is the strong one … Wonderful stuff … You could comfortably make the extension oversize, and finish machine it.

Yes, leave space for it to flow … The ideal is to cut a few "splines" on the male part; just like those ready-made woodwork dowels. Degrease both parts thoroughly.

Steel to Steel fits do give you a little time; but beware when working with Brass, etc. … Copper is an accelerant for the curing.

MichaelG.
14 November 2013 at 10:25 #135499
Danny M2Z
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@dannym2z
G'day Paul. Ask the experts.

**LINK** has all the answers

Regards from the land of the kangaroo

* Danny M *
14 November 2013 at 13:47 #135515
Michael Gilligan
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@michaelgilligan61133
No offence taken, Danny

Your advice is correct, of course; but it would be a pretty dull forum if we didn't share our experience.

MichaelG.
14 November 2013 at 17:38 #135527
Paul Barrett
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@paulbarrett57424
Thanks guys for the info. Much appreciated.

Paul
14 November 2013 at 17:44 #135528
mick
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@mick65121
Try the ArcEurotrade site they have a wide selection and all the applications are fully explained
14 November 2013 at 18:28 #135538
Gone Away
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@goneaway
A push (press)-fit wouldn't help any way …. it would just push the loctite out of the joint. For a press-fit to work, standard practice is to undercut the diameter of one piece (usually the male) at intervals for a thou or so to give the loctite a home. The full diameter bits in between then give the press fit.

Even if you use a sliding fit you may have a problem keeping enough loctite in the joint without undercuts unless the fit is a relatively loose one.

You could alternatively thread both parts – lots of shear-area then for the loctite and enough gap to produce a bond-line the way it's designed for. If concentricity is really important (rather than imagined …. depends on the motor/shaft joint) the extension can be finish turned afterwards.

Edited By OMG on 14/11/2013 18:28:59
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