Discussion in 'Woodturning Discussion Forum' started by Jamie Straw, Oct 18, 2015.
Not in my travel plans, though it would be fun!
Hmmmm ... I wonder if I could wear my Airstream if I get to go to the moon?
I'm sure that you are right about most faceshields, but 3M does offer polycarbonate shields with anti-fog / anti-scratch coatings for their PAPR units. Currently I have one of the plain polycarbonate shields installed, but I recently bought two spares that are the coated type. I may need to change my cleaning method when it's time to change shields.
Even though polycarbonate (Lexan) is extremely impact resistant, its scratch resistance isn't as good as some other plastics including plexiglass (Lucite). Plexiglass has slightly better optical properties. How to tell the difference between the two ... The easiest way if you have a sheet is that light pipes through the edges of plexiglass, but not polycarbonate. BTW, scratches can be buffed out of plexiglass, but they can't be buffed out of polycarbonate. So, don't use Novus 2 on your polycarbonate face shield because it will just add finer scratches to existing scratches. Novus 1 might possibly help because it basically hides fine scratches by filling them in with polish, but it doesn't remove the scratches left by Novus 2.
BTW, Jamie, because of the low scratch resistance of polycarbonate, care must be exercised in cleaning. Going after a mixture of sap and gritty dust by scrubbing with a wash cloth is only going to make things worse, but don't blame the cleanser when the cloth is grinding grit into the plastic. I let things soak and then see if Running water will flush away the crud. If not, I try the soak again and at most will gently wipe the surface with my fingers while holding the faceshield under running water. Goo-Gone will generally take care of any sticky stuff and then Simple Green or Palmolive will get rid of the Goo-Gone.
Spray well with 409.
Hose off with clean water.
Set it down and let it dry.
My water goes through a cation exchange deionizer so it doesn't leave spots, but you could just use cheap distilled water.
I wonder if applying Rain X would help. Works great on the car wind shield.
I have always used Windex on my face shield, it has the non fogging stuff but it don't work very well. Maybe that why?????
mystery spots, Dawn didn't impress them!
Reading this thread got me to feeling like my face shield could use a better cleaning so I took the anti-fog lens out of my Darth Vader rig and washed it. Had some oily looking spots bugging me so after a good rinsing with water I hit it very gently with a Dawn dish liquid/water solution, usually cleans things. Didn't impress these spots at all. I don't know what they are, either finish or tree sap at a guess. Not directly in the line of sight but I may have to consider a new shield soon.
The very first thing I always do when cleaning glass or plastic I have to try to see through is a good thorough rinsing to try to float any grit and dust off instead of grinding it in wiping or washing. After that I keep upgrading until the lens is clean enough or I am doing more harm than good. Wire wheels and leaded gas have both proven to be poor choices to clean with in the past. Bead blasting didn't work either.
ROFL!!! Live and learn, eh?
You always have a good idea to contemplate.
What grit did you try?
I have some extra fine glass beads 370 grit.
Should get the big glop off.
I could etch a Gator in the shield while I'm at it....
I'm wondering how flat the plastic is
This stuff on the plastic is annoying, more-so after I cleaned off the other dirt and dust. I'm wondering how flat the plastic is. I have a few pieces of glass laying around. I'm thinking I may try cleaning glass and plastic both and then laying the plastic on the glass and try shaving whatever is on it off with a well honed wood chisel. Been a long time since I took something to a true mirror finish. It was a two inch round disk and took me most of a morning. I have four inches of rain predicted in two days starting tomorrow. I may bring the face shield inside to work on while watching it rain. I predict it will be clean or a new shield on order before the rain stops!
A friend that had running horses had a large horse and jockey custom etched into the back glass of his pick-up truck. Never was sure how legal that was but it sure looked good! Years later a similar decal to imitate etching became available but all were exactly the same. Roland's was his horse and jockey.
It shouldn't ever be necessary to get any more aggressive than a brass bristle brush ... steel is just too rough on plastic. I think that mesquite borer juice is the same stuff from which polycarbonate plastic is made.
Hu, I'm sending the rain to you early. It's not that I'm tired of the rain, but stainless steel ways notwithstanding I can't get into my naturally occurring roofless open-air studio to do any turning. What does that have to do with face shields? Well rain on the outside and fogging on the inside and I would have to file an IFR flight plan to do any turning ... and I'm not qualified to turn on instruments. I'm strictly a VFR turner. It has been a heavy rain all day and night for two days ... And, yes, I know that is nothing compared to some places ... I grew up in Houston where forty days and nights of rain would be considered an average sprinkle. I suspect that the same could be said for New Orleans.
Think I can hear Johnny Cash warming up now . . .
Looks like you are right about the rain. I took a look at the sky leaving the barn a few minutes ago and opened up the drive through gate so I can drive back there to shut down if I need to. Tryiing to turn a piece of oak and getting frustrated. There is something hidden in that big block of half rotted oak and I can't seem to find it. Turned a smaller piece of the same stuff and it came out OK, not great, not bad. Seemed on the edge of something nice a few times but seemed on the edge of the burn pile just as often. I may have to quit turning for awhile if this rain doesn't cancel the statewide burn ban, my "almost bowls" stack up pretty fast! I'm resting two hours then I may quit for the day.
I don't know if you have noticed, I have moved out of a corner of your shop and into an old dairy barn. It keeps out most of the rain most of the time. The roof blows off a few times a year and I have to hammer it back down. Running out of places to put nails or screws.
We have been known to get a little rain down here as you suspect. The most I remember without a named storm was over nine inches in less than three hours. The local weatherman had predicted scattered showers. Fortunately he had an explanation: "The Good Lord wanted it to rain and it rained."
To finish off this long rambling post, I'm in mourning and shouldn't be trying to turn anyway. Just heard that Maureen O'Hara died.
I use the plastic overlays - peel off the old one put a new one - done.
Be aware cutting and polishing the surface of the plastic will reduce its strength.
It needs to be a labor of love. Don't think I could love any plastic that much.
I understand for you it may be the challenge of the quest more than the goal.
I can cut a decal ( adhesive vinyl) from a photo so it won't look like anyone else's but you might not recognize it as the photo either.
Silhouettes I can do justice to.
As long as we're off-topic (which is fine with me!)
It's is so much fun to have people from other states complaining about rain, when it's been partly cloudy here, 9 miles from Seattle, in the middle of Puget Sound. We'll get a little rain tomorrow, but nothing like Texas is getting!
All my turning has been put on hold whilst I suffer through a whole bunch of Pellet Stove Drama. Said drama should (please, please, please!) come to an end tomorrow when we install the one that's hanging from the engine hoist right now. (Well, not really hanging -- it's hooked to it, after being unloaded from the truck, but is touching the ground.) I committed to buying one 3 weeks ago to replace a very old one. Took an entire day to drive far away, pick it up, bring it home last week. Bad decision, pipe needed to be 6" and contrary to my plan, absolutely not a good idea to reduce to 3" (which is what's installed in the shop) Hubby unhappy. So, Thursday I found another one, real close to home, that is more modern, using 3" pipe. We will plop it in place tomorrow with the help of a strapping young man and a hubby-made industrial strength dolly. By tomorrow night, the shop should be warm, cozy and dry! Anyone around here need a pellet stove? I now have 2 for sale.
Face shields: I checked out the Plastx at Walmart, but I think I'll get the Nova kit instead. Forgot to look for the bug remover, but I heard years ago that CocaCola works well for that (on cars).
Supposed to rain 1st 3 days of the week here so I hauled a little extra wood into the shop so I do not have to get wet and muddy. Been over 2 months since getting more than 1/16 inch of rain so looking forward to a storm.
There is a relatively new plastic with properties that are very similar to polycarbonate called Trivex that was developed by PPG for the military and is now being used for eyeglasses. In my searching the web, I haven't found it available in sheets where it could be used for other purposes. Trivex has some properties that make it superior to polycarbonate because it doesn't have some of the problems found in polycarbonate such as not having internal stresses that can cause spider cracks at stress points like drilled holes or birefringence resulting when a sheet of polycarbonate is deformed by external force for an extended period (e.g., when used for a face shield it is bent into a curve by the frame of the shield). Trivex is ideal for lenses because of its superior optical clarity (higher transmittance) and because chromatic aberration (due to light dispersion) is much less than it is for polycarbonate.
My glasses are polycarbonate and the chromatic aberration (CA) really bothered me for many months. CA is the optical distortion that causes one side of high contrast edges to be blue and the other side to be red. I experienced birefringence problems on my Airstream helmet as a result of using an "aftermarket" visor. The substitute visor was too thick and didn't want to bend to fit the frame without a lot of force.
The scratch resistance is about the same as polycarbonate which is lower than other plastics.
forgot about coke
I forgot about coke! Years ago when the love bugs first appeared in quantity a car pulled in to our service station covered with them including the windshield. The passenger jumped out, grabbed a coke, and splashed it on the windshield. He cleared about a one foot circle in front of the passenger's seat. He said he wanted to see what they hit next time! No idea if he was serious but they went on their merry way with the driver as blind as ever.
Pretty sure that the bite in coke aside from carbonation is citric acid. That is what makes it cut bugs and road film I believe. I still use one once in awhile when I have a nasty film on glass.
If there wasn't half a country between us a pellet stove might be of some interest. Price of pellets it can be cheaper to feed one corn if it will run on it.
A note to everyone, not sure how much rain I got, a station up the road maybe fifty-sixty miles as the crow flies reported over eight and a half inches yesterday. Considering that the rain started before midnight and it's still got more to come that's a fair amount of rain. Flash flood warnings for river's and creeks. We have lost a bridge on my main way out in the past but I don't think it is an issue. Also, unlike further south, I have multiple ways out so I can always take another route and I'm high and dry. Too dry, got to go on a grocery run in a bit! Debating the wisdom of putting another coat of finish on a couple bowls. The air is soggy, probably just begging for it to blush. Slacked up for a bit, guess I'll go make sure my lathe is dry. A big limb is down in my front yard too, not sure if it is what I heard bouncing on my house roof or not. Life in the not so fast lane!
It wasn't so funny here where flooding has caused a lot of damage, some people saved from drowning, and several who died. I checked the rain gauge this morning and was surprised to see that we had 10.0 inches at the house ... a small amount compared to some other areas.
10" is a lot of rain anywhere. We get some video in the news of the flooding and rescues. Glad you are safe.
I had no idea you were in that kind of danger, my comments weren't meant to make light of any impending disasters.
Our choices are electricity, propane or heating oil, all seemingly more expensive than pellets. I don't know if they sell corn for burning around here. I've seen stoves that were listed for burning both pellets and corn, no idea how all that works! I guess I could go to a feed store and see what they have, LOL.