How To Repair Threads On Plastic
ham
ArboristSite Operative
- #i
I'm replacing the rear handle and freshening up my MS290. The threads for the brake assembly encompass, both screws backed the threads out with the screw.
Any thoughts? Information technology'due south not a stressed part. I was thinking of doing a wrap of teflon effectually the screw. Or maybe using a blazing hot soldering atomic number 26 and dimpling in the plastic
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- #2
Probably at least 5 different ways volition piece of work.
Many wraps of teflon tape, similar you suggested
Stick the end of a zip tie in the hole, like the toothpick in a wood screw hole trick.
Could shoot some hot snot in the hole right before assembly
Could tap for a slightly larger thread
Could helicoil, and use a machine thread screw thereafter.
- #3
Likewise i feel like some manufacturers screws that go into plastic are more aggressive than others. In fact i recall that old stihl screws for plastic and new stihl screws for plastic are slightly different, ane or the other may get enough bite.
- #4
I am having practiced luck with weed whip plastic string, I cut a piece the depth of the threaded hole then skive the end a flake for a taper so the bolt doesn't just button it down.
just drop it in the hole & put the commodities in.
- #five
I am looking at a similar problem on the recoil side. Anyone have a solution using Decon or JB Weld?
Roy
- #6
I take fabricated a repair like this ii unlike ways.
Ane is to fill up the hole with JB then when it's hardened drill and tap to your desired size. The second and easiest way is use a grease of some sort Vaseline or Lubriplate even grease gun grease. Glaze the screw / bolt threads lightly so the threads are still prominent and and then fill the hole with JB Weld or the epoxy of your choosing . Then put the commodities back into the hole into the moisture epoxy and allow it set overnight. In the am if you want to unscrew the bolt. The epoxy will take the shape of the bolt threads thus making a perfectly threaded hole. Yous may take to use a piece of tape to hold the commodities down into the hole while the epoxy hardens upward.
- #vii
I was thinking of both of your methods. Practice you lot accept a preference?
Roy
- #10
Lot of people don't know earlier you screw those screws used in plastic downwardly, you should turn the screw outward to allow it to drop in the original threads otherwise they hands grab the side of the hole and rethread or tap another thread inside the originals. The more it happens, the weaker the threads become until their shot. Prevention is the easiest solution however it doesn't always happen, especially when yous work on preowned saws.
You fellows have lots of good ways mentioned here to make or recondiition those boogered up threads to work over again. I usually looked for a bigger, self tapping screw when i run into that.
- #eleven
I'g replacing the rear handle and freshening upward my MS290. The threads for the restriction assembly comprehend, both screws backed the threads out with the spiral.
Any thoughts? It'south not a stressed part. I was thinking of doing a wrap of teflon around the screw. Or maybe using a blazing hot soldering iron and dimpling in the plastic
If you lot don't need the chain restriction then gut information technology and put information technology back together using a nut wager and bolt .
- #12
Nut washer and bolt .
- #13
Beat me to it. I only learned that one this by yr.
- #14
Strimmer line or cable ties
- #15
Ive had limited luck with long term fixes on plastic stihls but some other brands i heat the screw and drop information technology in...then absurd it quickly.
Sent from my LM-G820 using Tapatalk
- #xvi
Hasn't been much longer then that for me. I was told it was taught in the Stihl tech seminars.
- #17
I was thinking of both of your methods. Do you lot have a preference?
Roy
The grease on the threads works pretty good just be sure the threads are lubed well simply "make clean" if that makes sense.
ham
ArboristSite Operative
- #18
I ended up finding these. Heat set threaded inserts. It's overkill for my particular state of affairs but am going to go ahead and epoxy in a few in the interest of "doing it correct"
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- #19
I'd lean towards using a quality 2-part epoxy. Clean, dry, and degreaser most of import.
If at that place was enough meat around the hole, I'd drill it oversized and tap to a larger hole to give fresh make clean surface expanse to bond to. I'd fill the oversized tapped hole with epoxy and tap to the correct size for the OEM screw. If y'all insert a coffee stir straw into the epoxy y'all'll have your pilot hole, merely seal the end and brace centered in identify.
- #20
Way overkill & too much $$ for securing a cover, but but my 2 cents.
Before yous order all those brass inserts & tools, phone call your local Stihl dealers & cheque stock or order two # 9074 477 4130 screws. Couple of dollars at nearly, your existing screws are D4x15mm & these are larger M5x16. Drill the two cover holes out to M5 major to clear.
If y'all can strip those out, and so keep on!
Source: https://www.arboristsite.com/threads/what-is-the-best-method-to-repair-stripped-threads-in-plastic.348677/
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