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How to fix a plastic boss?

Nictrolis

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Hi all, new to the forum, but I just completed my SCT410.3 build and I've been having a blast with it. Maybe too much -- I've exposed a few stripped plastic bosses, guess I should have taken it easier with the electric screwdriver!

Anyone have a recommended fix for this? I've heard of solutions like filling the boss with epoxy, or melting some ABS with acetone and stuffing that into the boss, then drilling a new pilot hole. Is that the best option, or any other recommendations?

Cheers!!
 

Billl DeLong

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I recommend investing in a new cordless drill with a very lightweight clutch, I've got a listing of my favorite tools including the Metabo drill that I currently use here:
https://www.rcgroups.com/forums/showthread.php?3119059-Tools-for-the-pit-table

If it were me, and I stripped a thread, I would replace the part... not sure what a "boss" is that you are referring, part# would be helpful, but if you've stripped a sealed gear diff then you definitely will need to replace it or your diff will definitely leak.

Some people have had limited success with CA glue to mend minor stripped threads, but it's generally a short term solution.

Also keep in mind that TEKNO offers a 50% warranty for any parts you mail into them!
https://www.teknorc.com/warranty-repair/

Good Luck!
 

MAVERICK

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Hi all, new to the forum, but I just completed my SCT410.3 build and I've been having a blast with it. Maybe too much -- I've exposed a few stripped plastic bosses, guess I should have taken it easier with the electric screwdriver!

Anyone have a recommended fix for this? I've heard of solutions like filling the boss with epoxy, or melting some ABS with acetone and stuffing that into the boss, then drilling a new pilot hole. Is that the best option, or any other recommendations?

Cheers!!
It all depends on what part of it is something that needs to be removed for maintenance then replace it

but if it’s not a commonly removed pice I have used super glue but then the screw is staying put
 

Nictrolis

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Thanks Bill and Maverick.
I recommend investing in a new cordless drill with a very lightweight clutch, I've got a listing of my favorite tools including the Metabo drill that I currently use here:
https://www.rcgroups.com/forums/showthread.php?3119059-Tools-for-the-pit-table
I actually have this same tool, and it's great -- the bosses I fouled were because I forgot to switch up the clutch setting when going to a smaller screw diameter or shorter depth (both use lower clutch settings). Oops.

If it were me, and I stripped a thread, I would replace the part... not sure what a "boss" is that you are referring, part# would be helpful, but if you've stripped a sealed gear diff then you definitely will need to replace it or your diff will definitely leak.
Yeah there are a couple spots, nothing I'm super worried about replacing immediately. I like trying to stretch it out a bit before I replace anything anyway, might as well see how long it takes before I start the yard sale (aka leaving parts around the track).

A "boss" is the plastic cylinder that you thread... No idea why it's called that, except it clearly tells me I'm fired.

Some people have had limited success with CA glue to mend minor stripped threads, but it's generally a short term solution.

Also keep in mind that TEKNO offers a 50% warranty for any parts you mail into them!
https://www.teknorc.com/warranty-repair/
Yeah that was a major contributor to me buying. I'll have to check if they offer some discount if you replace with an upgrade, that would be nice.
Good Luck!
I'll need it.

Tonight I'm planning to test out making my own repair paste... Take some of the left over sprue trees and melt them with acetone, the see if I can use that to fill a hole, and how well that hole will then hold up... Good times!
 

devnull

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A "boss" is the plastic cylinder that you thread... No idea why it's called that, except it clearly tells me I'm fired.
Although I don't know for certain, it's a term that might have originated in manufacturing. It's used to describe a form that's created on a part to add capacity to add a hole, similarly to what you mentioned. That reference was a common term when I worked designing die cast dies.

And after a quick googley kinda search, what do ya know.

https://diecasting.com/blog/2016/01/04/design-tips-for-die-casting-parts/#bosses-incorporating
 
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