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Tapping leveler holes in phenolic resin for a zero clearance insert

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Forum topic by steveinaz posted 03-10-2015 02:48 AM 912 views 0 times favorited 10 replies Add to Favorites Watch
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steveinaz

17 posts in 634 days


03-10-2015 02:48 AM

I made a insert for my table saw from phenolic resin. The leveler holes I tapped allow the set screw to run freely, there is no resistance and thus no holding a set point. I used a regular 10-24 tap and a 1/2” set screw. What should I have done so the set screw does not run freely?

-- Steve in AZ


10 replies so far

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Aj2

684 posts in 1257 days


#1 posted 03-10-2015 02:56 AM

How about a drop of glue in each hole.With the set screw out let it set over night.Then run the screw back in for a interference fit.If it doesn’t work can always clean it up with the tap..Aj

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TheFridge

5764 posts in 945 days


#2 posted 03-10-2015 03:21 AM

Loctite maybe? Don’t know if it’s compatable with plastic but that’s my first thougt.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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Shadowrider

183 posts in 668 days


#3 posted 03-10-2015 03:31 AM

I used to use stuff called “vibra tight” on carb screws of race bikes. No matter what you did with the springs the screws would always work their way out and screw the mixture up. It hardened to a tough wax and worked well.

Silicone caulking might work too.

Edit: It was called Vibra-tite. This is it…. http://www.amazon.com/Vibra-TITE-VC-3-Threadmate/dp/B008D6GHY6/ref=pd_sbs_auto_8?ie=UTF8&refRID=1Y3JR86B97MJZ0KXQ2DY#product-description-iframe

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ChefHDAN

805 posts in 2309 days


#4 posted 03-10-2015 11:56 AM

Blue loctite will do the trick, have had same issue

-- I've decided 1 mistake is really 2 opportunities to learn.. learn how to fix it... and learn how to not repeat it

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Fred Hargis

3925 posts in 1952 days


#5 posted 03-10-2015 12:02 PM

Can you put threaded inserts into phenolic? I think that may have been what I would have tried.

-- Our village hasn't lost it's idiot, he was elected to congress.

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MrRon

3926 posts in 2703 days


#6 posted 03-10-2015 06:40 PM

What you should have done was to use a tap drill one size smaller than listed; a #27 drill instead of the #26. I do this with my inserts and the screws are tight.

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steveinaz

17 posts in 634 days


#7 posted 03-11-2015 04:11 AM

MrRon – Thank you, To clarify, are you using a tap to cut the threads or are you using the set screw to cut the threads? I tried using the set screw to cut the last couple of threads and I stripped the head. The phenolic resin sheet was too tough for the stainless steel set screw.

-- Steve in AZ

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waho6o9

7166 posts in 2036 days


#8 posted 03-11-2015 05:15 AM

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steveinaz

17 posts in 634 days


#9 posted 03-11-2015 02:09 PM

Thanks everybody, I used blue Loctite and it seems to be working, time will tell.

-- Steve in AZ

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MrRon

3926 posts in 2703 days


#10 posted 03-11-2015 03:13 PM


MrRon – Thank you, To clarify, are you using a tap to cut the threads or are you using the set screw to cut the threads? I tried using the set screw to cut the last couple of threads and I stripped the head. The phenolic resin sheet was too tough for the stainless steel set screw.

- steveinaz


TAP. I use 8-32 set screws on my inserts. Since you have already made the insert and drilled the holes, all you can do now is use a thread locker.

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