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post #1 of 10 (permalink) Old 04-03-2010, 12:53 AM Thread Starter
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Every now and then when I route a piece of Acrylic for joining, the edge comes out like a bunch of "UU's" connected together, all down the edge. Am I going too fast, too slow, the router is not steady enough and rocking (?) in the table. Or what???

Anyone ever have this happen and knew what to fix??

If the edge it wavy like this and when I "glue" it there are a lot of bubbles and it should be clear and free of bubbles.

thanks

Using a Roybi RE600 in a table with a Harbor Freight Phenolic plate
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post #2 of 10 (permalink) Old 04-03-2010, 06:55 AM
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Quote:
Originally Posted by lemonyx View Post
Every now and then when I route a piece of Acrylic for joining, the edge comes out like a bunch of "UU's" connected together, all down the edge. Am I going too fast, too slow, the router is not steady enough and rocking (?) in the table. Or what???

Anyone ever have this happen and knew what to fix??

If the edge it wavy like this and when I "glue" it there are a lot of bubbles and it should be clear and free of bubbles.

thanks

Using a Roybi RE600 in a table with a Harbor Freight Phenolic plate
Hi Charles - are you getting it along the entire edge or just the trailing inch or so?
I get that some on wood along the last inch or so. I think it's referred to as "snipe". Looks like the work vibrates a little when the infeed fence looses control of the work. Been able to minimize some adjusting the featherboard but haven't eliminated it. Don't know if I will be able to. The setup I am using know has a .045 cut when jointing. I think I would need to cut some more shims to reduce it further or conjure up a microadjust for it.
If you are getting it along the entire length, I would guess the bit speed is to slow or feed rate is to high, or both. May also try a larger diameter bit.
Good Luck.

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post #3 of 10 (permalink) Old 04-03-2010, 02:20 PM Thread Starter
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Thanks John

No it's along the entire length of the edge. I've tried to slow down the feed rate but I just got in some bigger dia bits and up the speed some more and try it.
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post #4 of 10 (permalink) Old 04-03-2010, 03:41 PM
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Hi Charles

You may want to try the Shear angle bits ,it will take off less or to say like a drill bit. the normal bit is like using a Ax with a sq.blow to the stock, the skew angle of the bit will cut off the stock clean..they make bits just for plastic they have a very big shear angle on the bits..(one flute the norm.)


Shear Angle Flush Trim Bits
MLCS Flush Trim and Shear Angle Flush Trim Router Bits

=========

Quote:
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Thanks John

No it's along the entire length of the edge. I've tried to slow down the feed rate but I just got in some bigger dia bits and up the speed some more and try it.



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post #5 of 10 (permalink) Old 04-05-2010, 01:00 PM Thread Starter
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Thanks Bob for the link. I know that there are drill bits for plastic but have not run across bits yet.
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post #6 of 10 (permalink) Old 04-05-2010, 06:08 PM
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+1 on the shear. For the smoothest possible finish, a (pricey but) carbide spiral bit has even more shear to it. With one of these bits, (assuming the material isn't *too* thin) some part of the bit is constantly cutting the acrylic. Presto.. the UU's go away.

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post #7 of 10 (permalink) Old 04-05-2010, 07:21 PM
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Originally Posted by lemonyx View Post
Thanks Bob for the link. I know that there are drill bits for plastic but have not run across bits yet.
Hi Charles, if you do enough of those things you may be able to justify one of these guys.
Solid Carbide Spiral Plastic 'O' Flute -ToolsToday.com- Industrial Quality Solid Carbide Bits

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post #8 of 10 (permalink) Old 04-05-2010, 07:49 PM
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Hi Charles

I have 3 types that I use all the time, I got one from Grizzly for 12 bucks the long fluted one, one from Precision Bits, the one that looks like it's made to peel potatoes but it's for cutting thin plastic ( i.e. 1/8" )and the smaller one that looks like a standard 3/16" router bit but with longer flutes..

Worth the price if you do a lot of plastic stuff.

======

Quote:
Originally Posted by lemonyx View Post
Thanks Bob for the link. I know that there are drill bits for plastic but have not run across bits yet.


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Last edited by bobj3; 04-05-2010 at 08:02 PM.
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post #9 of 10 (permalink) Old 04-12-2010, 10:46 AM Thread Starter
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Thanks John and Bob, looks like I'll be ordering some more bits.
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post #10 of 10 (permalink) Old 04-30-2010, 10:37 AM
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I'm still trying to fix this myself, I'll let you know any updates
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