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Thread: Which Plastic?
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1st Oct 2012, 06:43 PM #1.
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Which Plastic?
I'm making a backstop to prevent the chance of the dividing head sliding out of the swivel base and onto the concrete floor when the head is mounted vertically on my mill. Rather than chip more of the already chipped paintwork, I want to incorporate a plastic bumper in the vertical leg of the angle. I have a 2 inch diameter short length of nylon. Easy enough to turn but it appears too soft. What ever plastic I use I'm hoping that it is rigid enough the ensure repeatability should the dividing head be removed then reinstalled. The plastic bumper would be about 7 - 8 mm in diameter by about 3mm thick with a spigot turned on the back to enable press fitting into the angle. The plastic has to be black.
I'm thinking of some over the counter item that could be turned down. Something like a plastic tap washer but they tend to be white. I don't mind buying some plastic rod from one of the industrial suppliers over here. Just needs to be the right rod. Any suggestions?
BT
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1st Oct 2012, 07:17 PM #2
Hi Bob,
I would go with some delrin. Comes in Black or white and is nice and hard so repeatability should not be a problem. The only problem is you will have to make it a press fit, it cannot be locktighted or glued in any way.1915 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.
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1st Oct 2012, 07:25 PM #3
2nd the Delrin
Frisky wife, happy life. Then I woke up. Oh well it was fun while it lasted.From an early age my father taught me to wear welding gloves . "Its not to protect your hands son, its to put out the fire when u set yourself alight".
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1st Oct 2012, 07:30 PM #4
Hi BT,
I'd go for a stroll through the homewares section of your local department store, it's amazing what you can find when you start looking at everyday kitchen utensils and stuff with a different eye.
Regards
Ray
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1st Oct 2012, 07:54 PM #5Diamond Member
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Suitable Plastic
Bob
I have some offcuts in a black plastic, tough stuff thats machinable, cannot remember the name of it at the moment. (This happens as one gets older)
I will mail you a piece in the morning.
regards
Bruce
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1st Oct 2012, 07:57 PM #6Product designer retired
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Type of plastic
Bob, I'd go with acetal. It's easy to machine and fairly hard. Great stuff.
Ken
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1st Oct 2012, 08:30 PM #7Philomath in training
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I think I have a small diameter piece of black acetal somewhere if you want to try it out.
Michael
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1st Oct 2012, 09:49 PM #8.
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Thanks for the suggestions Boys.
Bruce and Michael,
Only if it's not too much trouble.
Bob.
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2nd Oct 2012, 01:29 AM #9Most Valued Member
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Yep, Delrin (acetyl) is the go. It can be glued with epoxy. Dupont recommend sanding with 280 grit to improve the bond.
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2nd Oct 2012, 02:57 AM #10Senior Member
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Delrin (POM) is hard to glue, to say the least. You can flame it or better etch with phosphoric acid.
PA would be good for a stop, but also not something you like to glue.
Nick