Lathe Tool Grinding Helper
#25
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: 
  • 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 -
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Messages In This Thread
Lathe Tool Grinding Helper - by randyc - 10-16-2017, 06:26 PM
RE: Lathe Tool Grinding Helper - by pepi - 10-17-2017, 06:48 AM
RE: Lathe Tool Grinding Helper - by randyc - 10-17-2017, 09:25 PM
RE: Lathe Tool Grinding Helper - by randyc - 10-19-2017, 08:36 PM
RE: Lathe Tool Grinding Helper - by EdK - 10-20-2017, 05:40 AM
RE: Lathe Tool Grinding Helper - by randyc - 10-20-2017, 03:41 PM
Shocking Surprise - by randyc - 10-20-2017, 08:11 PM
RE: Lathe Tool Grinding Helper - by Dr Stan - 10-20-2017, 08:33 PM
RE: Lathe Tool Grinding Helper - by EdK - 10-20-2017, 08:55 PM
RE: Lathe Tool Grinding Helper - by randyc - 10-20-2017, 09:41 PM
RE: Lathe Tool Grinding Helper - by EdK - 10-20-2017, 09:53 PM
RE: Lathe Tool Grinding Helper - by randyc - 10-20-2017, 10:25 PM
RE: Lathe Tool Grinding Helper - by EdK - 10-20-2017, 10:35 PM
Some Progress - by randyc - 10-27-2017, 07:01 PM
RE: Lathe Tool Grinding Helper - by EdK - 10-27-2017, 07:03 PM
RE: Lathe Tool Grinding Helper - by f350ca - 10-27-2017, 08:04 PM
RE: Lathe Tool Grinding Helper - by randyc - 10-27-2017, 09:38 PM
Progress Or Not ? - by randyc - 11-03-2017, 10:14 PM
Three Steps Forward, Two Steps Back - by randyc - 11-07-2017, 05:33 PM
FINALLY A Tiny Bit Of Progress - by randyc - 11-09-2017, 06:09 PM
Slight, Slight Amount Of Progress - by randyc - 11-26-2017, 11:25 PM
Unexpected Material Problem - by randyc - 11-29-2017, 06:51 PM
RE: Lathe Tool Grinding Helper - by randyc - 11-29-2017, 09:22 PM
RE: Lathe Tool Grinding Helper - by rleete - 11-30-2017, 08:06 AM
Followup On Material Problem - by randyc - 11-30-2017, 06:37 PM
RE: Followup On Material Problem - by Highpower - 11-30-2017, 09:55 PM
RE: Followup On Material Problem - by randyc - 11-30-2017, 10:02 PM
RE: Lathe Tool Grinding Helper - by Highpower - 11-30-2017, 10:30 PM
RE: Lathe Tool Grinding Helper - by randyc - 11-30-2017, 10:53 PM
RE: Lathe Tool Grinding Helper - by randyc - 12-01-2017, 12:37 AM
RE: Lathe Tool Grinding Helper - by rleete - 12-01-2017, 02:29 PM
RE: Lathe Tool Grinding Helper - by randyc - 12-09-2017, 05:01 PM
Completing the legs - by randyc - 12-10-2017, 05:48 PM
Working On The Base Plate - by randyc - 12-29-2017, 08:23 PM
RE: Lathe Tool Grinding Helper - by f350ca - 12-30-2017, 12:17 AM
RE: Lathe Tool Grinding Helper - by Highpower - 12-30-2017, 01:10 PM
RE: Lathe Tool Grinding Helper - by f350ca - 12-30-2017, 05:30 PM
RE: Lathe Tool Grinding Helper - by randyc - 12-30-2017, 08:14 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-15-2018, 08:37 PM
RE: Lathe Tool Grinding Helper - by f350ca - 01-15-2018, 09:40 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-16-2018, 04:42 PM
MORE Drama - by randyc - 01-18-2018, 08:23 PM
RE: Lathe Tool Grinding Helper - by f350ca - 01-18-2018, 08:43 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-18-2018, 08:58 PM
RE: Lathe Tool Grinding Helper - by Highpower - 01-18-2018, 10:12 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-18-2018, 11:17 PM
RE: Lathe Tool Grinding Helper - by Vinny - 01-18-2018, 11:14 PM
RE: Lathe Tool Grinding Helper - by Highpower - 01-19-2018, 11:54 AM
RE: Lathe Tool Grinding Helper - by f350ca - 01-19-2018, 09:18 AM
RE: Lathe Tool Grinding Helper - by Vinny - 01-19-2018, 02:10 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-19-2018, 05:47 PM
RE: Lathe Tool Grinding Helper - by f350ca - 01-19-2018, 09:52 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-19-2018, 11:19 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-20-2018, 05:56 PM
RE: Lathe Tool Grinding Helper - by f350ca - 01-20-2018, 07:48 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-20-2018, 08:26 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-21-2018, 04:39 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-27-2018, 04:52 PM
RE: Lathe Tool Grinding Helper - by Pete O - 01-27-2018, 08:29 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-27-2018, 09:11 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-28-2018, 04:26 PM
RE: Lathe Tool Grinding Helper - by f350ca - 01-28-2018, 05:14 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-28-2018, 06:01 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-29-2018, 07:20 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-30-2018, 05:22 PM
RE: Lathe Tool Grinding Helper - by f350ca - 01-30-2018, 05:55 PM
RE: Lathe Tool Grinding Helper - by randyc - 01-30-2018, 07:20 PM
RE: Lathe Tool Grinding Helper - by randyc - 02-16-2018, 06:13 PM
RE: Lathe Tool Grinding Helper - by f350ca - 02-16-2018, 08:49 PM
RE: Lathe Tool Grinding Helper - by randyc - 02-16-2018, 09:38 PM
RE: Lathe Tool Grinding Helper - by Pete O - 02-16-2018, 09:48 PM
RE: Lathe Tool Grinding Helper - by randyc - 02-17-2018, 05:50 PM



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