POTD- PROJECT OF THE DAY: What Did You Make In Your Shop Today?

[MikeWi]

They don't say anywhere that I can find that there's a UV blocker in it. Without that, it will yellow quickly (found that out the hard way). Anyone know if it does?

 

[dkemppai]

As a product available in the EU, acetone makes the most sense. It seems like a safe enough way to do it considering the hazards using hot acetone entails. I'd certainly give it a shot. Frosty headlights on your baby can be a real tear jerker.

Headlights are polycarbonate now, IIRC. I don't think that acetone on polycarbonate is good.

It must be something that's in a volatile solvent, and leaves the hot bottle with the solvent. And stays behind after the solvent 'goes away'. But guessing that acetone might not be it because acetone on polycarbonate is bad.

Edit. Some references are acetone. Hmmm. Usually that's bad with polycarbonate. I'm starting to smell snakeoil salesman stuff here...


Anyone have an MSDS for the stuff?

 

[pontiac428]

Headlights are polycarbonate now, IIRC. I don't think that acetone on polycarbonate is good.

It must be something that's in a volatile solvent, and leaves the hot bottle with the solvent. And stays behind after the solvent 'goes away'. But guessing that acetone might not be it because acetone on polycarbonate is bad.

Edit. Some references are acetone. Hmmm. Usually that's bad with polycarbonate. I'm starting to smell snakeoil salesman stuff here...


Anyone have an MSDS for the stuff?

These plastics are softened by acetone:

• PVDF
• Polycarbonate
• Polysulfone
• Cast Acrylic
• PVC
• CPVC

Polycarbonate will be affected, though I suspect that a lot of acryl based plastic is used in light housings. It's obvious when they weather that they have a UV coating over the plastic.

 

[BGHansen]

POTD was a clean up job on my Clausing 5418 lathe. I wrapped up the first run of reproduction Erector set part number 'B2' wooden-handled screwdrivers which made quite a mess.





I started by vacuuming up the major debris, wiped everything down with a rag, then a second vacuuming followed by a second wipe-down. On the plus side, I found some tools in the chip pan that had disappeared.



Thanks for looking, Bruce

 

[randyjaco]

As a product available in the EU, acetone makes the most sense. It seems like a safe enough way to do it considering the hazards using hot acetone entails. I'd certainly give it a shot. Frosty headlights on your baby can be a real tear jerker.

I would be very careful using Acetone on plastic or any surfaces. Over the years I have totally ruined numerous plastic items by just exposing them to drops of acetone. It is pretty reactive stuff. Test carefully prior to using. Reaction times vary greatly.

 

[woodchucker]

Headlights are polycarbonate now, IIRC. I don't think that acetone on polycarbonate is good.

It must be something that's in a volatile solvent, and leaves the hot bottle with the solvent. And stays behind after the solvent 'goes away'. But guessing that acetone might not be it because acetone on polycarbonate is bad.

Edit. Some references are acetone. Hmmm. Usually that's bad with polycarbonate. I'm starting to smell snakeoil salesman stuff here...


Anyone have an MSDS for the stuff?

so you are not putting it on with a brush, you are using the vapor to re-melt the surface of the polycarbonate and smooth it over.
You can use a propane torch on acrylic to make the edge like glass. So it makes sense that the acetone heated vapor will do the same.

 

[dkemppai]

so you are not putting it on with a brush, you are using the vapor to re-melt the surface of the polycarbonate and smooth it over.

From what I've read, acetone doesn't melt polycarbonate.

It does damage it by entering the surface when exposed, and leaving pores when it dries off. But maybe the acetone is exposed for such a short period of time it doesn't matter.

I'm wondering if this is more like spray paint, where the solvents allow the paint to be carried to the target, then evaporate.

Ads for this stuff refer to it as a polymer. Not sure what else they're doing.

Half wondering if it's cyanoacrylate in acetone or something simple like that. (Super glue was first developed as an optical lense material, IIRC.).

Don't know. It's an interesting process. Not sure I'd want to be exposed to it until I know what's in it, tho...

 

[pontiac428]

I don't think there's any polymer, unless you consider the fact that acetone is a building block for plastic components methyl methacrylate and bisphenol A, both of which are in polycarbonate.

This stuff is as chinese as Mu Shu, so there's no SDS or safety info.

The best I could come up with is a mixture for a spray clarifier minus the propellants:

Acetone, butyl acetate, and methyl isobutyl ketone solvents with a propylene glycol methyl ether acetate or something similar with a lower BP as a surfactant.

I found mixed results with pure acetone on the web, it seems to me that surface prep and wet sanding the factory coatings is the key. Lots of confounding info with very little facts to support it out there. No SDS of course, it's a consumer commodity.

 

[toprecyler]

Made a replacement bolt for a beam gantry granite saw. Old one was sloppy in motor arbor from years of use, and head was rusting away.

I made the threads oversized pitch diameter to make up for wear in the motor arbor. Got it to fit on second test fit. Threads are 36mm x 4mm pitch, left handed. Also trued up Blade spacer, and added a oring groove to help act as a lock washer. The operator has had the bolt coming loose lately when starting up.






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[twhite]

It is finally nice and cool out. So I had a choice today. Trim an oak tree over my garage. Or mount my vise and arbor press to my rolling bench.

Guess what I chose

Vise is done. Next up is the little press.

Cutting oil is my blood.