Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 11 of 11
Thread: Tips for Machining PVC Plastic
-
25th Jun 2013, 04:19 PM #1Senior Member
- Join Date
- Feb 2011
- Location
- Mornington Peninsula
- Posts
- 183
Tips for Machining PVC Plastic
Just after some wisdom from the collective.
I'm machining up some plastic bushings out of PVC.
I sharpened up a cobalt (Looks like HSS but has cobalt written on it) piece of tool steel.
It cuts really well and leave an excellent finish but its makes lots of strings, for want of a better word.
It doesn't make actual chips.
The stringy stuff just bunches up and makes a big birds nest.
I don't need to remove a lot of material so that's maybe why it won't chip.
Any hints or tips or pictures of how to sharpen a tool for machining plastics?
Cheers
Justin
-
25th Jun 2013, 04:22 PM #2
Plastic, acrylic etc does just what you are saying. If it came off in chips likely there would be a problem like blunt chisel etc.
Any woodturning chisel should turn PVC as I imagine steel machine bits would too
-
25th Jun 2013, 04:28 PM #3Senior Member
- Join Date
- Feb 2011
- Location
- Mornington Peninsula
- Posts
- 183
Yeah I thought as much!!!
Its cutting beautifully actually just messy stringy stuff everywhere and it bunches up.
Mind you it doesn't affect the surface finish.
Cheers
Justin
-
25th Jun 2013, 04:31 PM #4Senior Member
- Join Date
- Oct 2011
- Location
- Newstead Victoria
- Posts
- 459
Try a piece of hss with a groove ground across the rake face might help othrwise you going to make lots and lots of string.groove will distort the chip flow.might have to play with it.sssh........t stuff to do like nolothane.
-
25th Jun 2013, 05:29 PM #5
I have only ever had it come off in strings. Nice sharp tool, highest rpm possible and it will cut very cleanly. I machined up some gear blanks a while back, I had ribbons flying a couple of meters.
Cheers,
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
-
25th Jun 2013, 09:28 PM #6Senior Member
- Join Date
- Apr 2010
- Location
- Rural Victoria
- Posts
- 358
Here's a good tip... don't get it too hot or you will die.
The gasses released by heating PVC include cyanide which has well-documented evidence of reduced longevity.
Machining PVC with coolant should be perfectly safe. Hell, I have even cut PVC tube with my cutoff saw.... not dead yet. Repeated use in an enclosed space might not be healthy......
I am not trying to spoil your fun. Just be careful
-
25th Jun 2013, 09:30 PM #7
HSS is the way to go, but you won't get a chip from it.
If you do get plastic to chip, let us know as no one I am aware of has done it, mentioned it, written about it or posted it on the web.
The HSS should be well sharpened with the cutting edge honed to a extremely sharp edge by a finishing stone and turned at high rpm.
I have turned about thirty odd jobs of the black poly solid stuff over the years and never got it to chip. Good finishes were attained through sharp edges and high RPM.
Grahame
-
25th Jun 2013, 10:18 PM #8Most Valued Member
- Join Date
- Nov 2007
- Location
- melbourne australia
- Posts
- 3,228
-
25th Jun 2013, 11:04 PM #9
-
26th Jun 2013, 07:22 AM #10Member
- Join Date
- Oct 2011
- Location
- Brisbane
- Posts
- 65
For HDPE, the best finish I got was when the power cross feed was set up for threading M12x1.75. The finish was near mirror like! Things happened scary fast with that setting at maximum RPM so I face my parts by hand now. I move the tool a lot faster than ally, but not as fast as I can wind the handle.
-
26th Jun 2013, 09:02 AM #11Senior Member
- Join Date
- Feb 2011
- Location
- Mornington Peninsula
- Posts
- 183
Well its nice to know I'm on the right track!
Thanks for all the hints, tips and safety advice.
Its machining beautifully and no signs of extra heat.
Cheers
Justin
Similar Threads
-
SOLD: Machining book"tabletop machining"
By woodsurfer in forum METALWORK - Machinery, Equipment, MARKETReplies: 4Last Post: 7th Feb 2012, 06:52 PM