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Thread: Machining HDPE considerations
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23rd January 2012, 06:44 AM #1SENIOR MEMBER
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Machining HDPE considerations
Hi all,
Quick question. While cutting my HDPE block the other day, the cutter was very harsh and noisy machining in one direction. Is this an indication of too fast a feed rate?
Thanks. Russell.Pen Affair Craft Supplies - Cheapest Pearl Ex & Pemo Polymer Clay in Australia
http://craftsupplies.penaffair.com
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23rd January 2012 06:44 AM # ADSGoogle Adsense Advertisement
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23rd January 2012, 07:14 AM #2Member
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Could be an indication of cutting in the wrong direction. Plastics and metals like to be climb cut.
Gerry
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23rd January 2012, 09:12 AM #3
and use a very sharp cutter
vapourforge.com
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23rd January 2012, 02:53 PM #4SENIOR MEMBER
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Well, I'm designing in Aspire. The 3D Roughing toolpath is a Z-Level raster along Y. The only other option is a 3D raster. I'm not sure what this does though. The finishing toolpath is a climb cut, but the noise is during the roughing. As for the cutter, it's a brand new 4mm, 2-flute carbide ballnose, only used on one other small cut in a pine stud.
It probably didn't help that the clamp wasn't holding properly and the job moved some, and I ended up holding it in place with a pushstick while it was cutting, so I'm not sure if it might have been vibration from looseness?
Russell.Pen Affair Craft Supplies - Cheapest Pearl Ex & Pemo Polymer Clay in Australia
http://craftsupplies.penaffair.com
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24th January 2012, 09:44 AM #5Member
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Yes, vibration can make add a lot of noise. I don't think you can avoid conventional cutting when using a roughing path in Aspire, so the best you can do is make sure the workpiece is held securely.
You might want to pick up a single flute "O" flute bit for plastics, though, it'll cut much better.Gerry
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10th February 2012, 01:41 PM #6New Member
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10th February 2012, 05:06 PM #7SENIOR MEMBER
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Rain's been keeping me out of the shed, so I'm behind schedule, but the weather seems to be clearing a little, so I'll have to start shopping for those single 'O' flutes.
As for the speed, I think I'm running as fast as the couplers are rated, but I'm still trying to figure out whether 1500mm/m is truly the max they can operate at. I'm not going to tempt that fate till I have some more experience though.
Russell.Pen Affair Craft Supplies - Cheapest Pearl Ex & Pemo Polymer Clay in Australia
http://craftsupplies.penaffair.com
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10th February 2012, 05:40 PM #8
i was running 3d cut , 8mm carbide bullnose 2 flute spiral at 40mm/s or 2400mm/m ( flat out for HDPE) , with a real shallow 2mm cut
12,000 rpm
rough cut with a 2mm pass
finished with 0.4mm pass
each mould was 5 hours ( 3 of them in HDPE )
>??? dont know if im doing it right , but it works , ???
the 45deg finish cut , left hairs on 2 sides ( not climb cut ) but they rub off with your thumbnail
i think the max speed for your couplers is more for out of balanced product , but then again i wouldnt like to see it hit a stop at full speed
ive backed my acceleration right off for a "smooth change of direction "
as for the rain , a 200mm heavy dew over night is normal here , i think QLD needs to build better drains , there deadly 8 foot deep ones on the sides of the roads in darwin , the drains arnt deadly , it when someone hits a drive way they die
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10th February 2012, 07:35 PM #9SENIOR MEMBER
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LOL on the "dew".
How did you fit an 8mm bit? I thought 7mm was the max these could take?
Russell.Pen Affair Craft Supplies - Cheapest Pearl Ex & Pemo Polymer Clay in Australia
http://craftsupplies.penaffair.com
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11th February 2012, 04:21 AM #10
saw some E11 collets on ebay at 8mm and also bought a 1.5mm and 1mm , to complete the cheep set 2-7.5mm , think they were out of germany
cheers ken
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