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Old 09-09-2013, 09:46 AM
danieldance danieldance is offline
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Default Trim Router for Onion Skinning?

I've been machining mostly polycarbonate and Baltic birch plywood with my Stinger CNC and everything is working extremely well (meaning my spoilerboard is not getting touched), but i'm still left with a thin onion skin when I finish parts.

It has been recommended to me that a trim router would work well to remove the onion skinning and clean the edges of the parts.

My question is, that can I use a trim router for this, and be able to use it handheld manually without the need for another jig? I'm looking for a simple and efficient way to do this manually without having to make a production rig etc...

Any help is appreciated.

Also, what type of trim router bits would you recommend if this is the proper way to go?

Thanks again everyone!
Dan
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Old 09-09-2013, 09:51 AM
Scott Ciocca Scott Ciocca is offline
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At the shop I used to work for had PC trim routers and used an Amana 3/16 flush trim bit to do this it fits in the 1/4 inch kerf without hitting both edges.

http://www.amanatool.com/bits-fv/mr0...flushtrim.html
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  #3  
Old 09-09-2013, 01:53 PM
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Mick Martin Mick Martin is offline
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I use a palm size De-Walt trim router, any flush trim router bit will work, my trim router only took 1/4 router bits
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Old 09-09-2013, 02:20 PM
danieldance danieldance is offline
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Quote:
Originally Posted by Mick Martin View Post
I use a palm size De-Walt trim router, any flush trim router bit will work, my trim router only took 1/4 router bits
Thanks.
So you can just hold the trim router by hand without a jig and manually move around the perimeter of the part? (No need for a jig or guide)

Thanks again
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  #5  
Old 09-09-2013, 02:45 PM
rcrawford rcrawford is online now
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Definitely no need for a jig. Depending what bit you get, it will have a bearing on the top or the bottom - just run the bearing along the cut portion and the bit will trim the rest off flush.
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  #6  
Old 09-09-2013, 02:50 PM
hefty hefty is offline
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Dan,
I've machined polycarb for 10 years (before I owned a CNC). I would suggest a cheap tabeltop router base (Sears, Bosch, etc.) and mount a trim router in it. Bit going throught the top (think mini router table). I have 5 of these in my shop, each one dedicated to a function. I even have one that is mounted in a Harbor Frieght table that only cost $20. Use a carbide bit with a bearing installed (at the far end). This will clean up your edge very nice and will match the CNC cut perfectly.
I do not recommend doing this freehand becasue you will have a hard time keeping consistent pressure between the polycarb and the bearing on little parts. The bearings on the bit have a little play and the amount of pressure you excert will change the depth of cut so that you can see it and feel it with a fingernail. You don't notice this with wood but with hard plastics you do. I also add sandbags/ weights to my little router tables; I feel like this reduces the vibrations and makes a cleaner cut.
I saw your website and the size parts you make are similiar to mine. I use 3D tabs and cut them down the middle with a vibratory cutter. I then use the table mounted trim router to remove the tabs (and chamfer the edges). You may want to experiment with this instead of the onion skin. I find polycarb very difficult to onion skin cut even if it is very thin since it is so tough.
Best Regards,
John
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Old 09-09-2013, 03:06 PM
Scott Ciocca Scott Ciocca is offline
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The 3/16 bit I posted has a 1/4 shaft for the router
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