11-30-2017, 06:37 PM
I apologize for the wide divergence from the original topic. I became so frustrated with the above turning process that I just couldn't continue without chasing down this nasty problem. This is what I've learned today, starting with personal observations.
The characteristics of the material:
This is what I’ve learned from various sources, some anecdotal:
From the above, my material would not seem to be Delrin - maybe Nylon. The icing on the cake would be to know for sure that the material is Nylon (so that I can avoid it in future). I have a piece left if anyone can suggest a means to evaluate it –
I hope that this has been put bed, I thought that I was working in The Twilight Zone ! Trying every conventional trick learned over a l-o-n-g time produced no improvement (some trials were worse than when I started). I eventually obtained acceptable results but with methods and configurations that should not have been required ! I’ve probably turned a quarter mile of Teflon rod over the years and it was a piece of cake compared to this nasty stuff, LOL.
Rleete: since you have a lot of experience with Delrin, and if you're reading this, can you please do a sanity check on the above and let me know your opinion ? Thanks -
The characteristics of the material:
- Purchased on eBay from two different sellers
- Bought 1-1/16 dia x 2 ft rod and 8 x 8 x 2 inch plate, both are black
- Rod is a dull finish, the slab is a mirror finish on both sides (saw cut on edges).
- 8 inch square plate has "72399" hand-written on one edge in blue letters
- 1-1/16 rod has no marking but at one end the remains of a torn away white label
- The rod is not truly round or straight, it has some “knobby” areas along the length
- As noted, turning produces long, tough very elastic strings
- Curly strings of the material burn readily with black, sooty smoke and mild melted plastic smell
This is what I’ve learned from various sources, some anecdotal:
- Nylon comes in both white and black
- Nylon has the turning characteristics described: rough surface finish when turning, stringy, elastic chips
- Delrin does not produce tough, elastic chips that will stretch nearly twice their length before breaking
- Delrin burns but with an odor that will knock you off your feet
- Delrin is always marked (in whatever code) with BLUE letters
From the above, my material would not seem to be Delrin - maybe Nylon. The icing on the cake would be to know for sure that the material is Nylon (so that I can avoid it in future). I have a piece left if anyone can suggest a means to evaluate it –
I hope that this has been put bed, I thought that I was working in The Twilight Zone ! Trying every conventional trick learned over a l-o-n-g time produced no improvement (some trials were worse than when I started). I eventually obtained acceptable results but with methods and configurations that should not have been required ! I’ve probably turned a quarter mile of Teflon rod over the years and it was a piece of cake compared to this nasty stuff, LOL.
Rleete: since you have a lot of experience with Delrin, and if you're reading this, can you please do a sanity check on the above and let me know your opinion ? Thanks -