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Thread: "Kickback" when using a pin router with downcut spiral? Reply to Thread
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  Topic Review (Newest First)
10-14-2015 01:13 PM
dcdc You da man Stick486
10-14-2015 12:07 PM
Stick486 we gpts PDF's for that too...

didn't think of that the bit may have moved...
10-14-2015 10:39 AM
dcdc Thanks for the tips, it's daylight and I can get back to experimenting finally. I also think I didn't have the bit far enough into the collet...now my collet is kinda stuck to the router probably from the chatter during the events. Hopefully it's not a big problem. What a bonehead!
10-14-2015 08:52 AM
Cherryville Chuck One of your problems could be the bit flexing so the extra passes would help in that case. You can get straight bits with a shear angle on the cutter. Not quite as good as a spiral and not quite as cheap as a straight angled straight bit but a decent compromise between the two.
10-14-2015 03:45 AM
Stick486
Quote:
Originally Posted by dcdc View Post
Well then I wouldn't be able to do inside work like shapes for resin inlays. Plus it would make the whole pin system a waste of time. And from what I understand the 1/4 inch bearings don't last very long besides being unavailable locally, and it has to be 1/4 inch because of the shape of some of the pattern, not seen in the pics.
improve your pin system...
lower the block holding the pin so that's it's closer to the work thus reducing flex...
add gussets to the pin block and fence..
add gussets to the table and fence..

Not so w/ better bearings...
better bearings will out last the bit many times over...
there are bearing guided ¼'' spiral flush/trim bits..
Industrial router bits-Double-bearing spiral flush trim router bits-CMT tools
Whiteside Machine Company

Quote:
Originally Posted by dcdc View Post
Do you guys think 2x 1/4" passes is appropriate for 1/2" birch ply with this 1/4" down spiral bit? Maybe I should do it in 3 passes instead? I would really like to keep the number of passes down, but I don't currently have a bandsaw to cut the stock within 1/16 to do one pass.
experiment...
4 passes...
then drop to three then two passes...

would a 3/8'' dia bit work???
way many more choices...

I believe that two ¼'' passes is a bit much for for a ¼'' bit...
also, the glue in the BB isn't/won't be the bit's friend...

use a jigsaw.
w/ a good saw and the right blade you'll be amazed how quick and efficient it can be...
in a lot of cases faster than a BS...
10-14-2015 02:24 AM
dcdc Do you guys think 2x 1/4" passes is appropriate for 1/2" birch ply with this 1/4" down spiral bit? Maybe I should do it in 3 passes instead? I would really like to keep the number of passes down, but I don't currently have a bandsaw to cut the stock within 1/16 to do one pass.
10-14-2015 02:16 AM
dcdc Well then I wouldn't be able to do inside work like shapes for resin inlays. Plus it would make the whole pin system a waste of time. And from what I understand the 1/4 inch bearings don't last very long besides being unavailable locally, and it has to be 1/4 inch because of the shape of some of the pattern, not seen in the pics.
10-14-2015 02:02 AM
Stick486 go w/ a bearing guided flush trim bit...
10-14-2015 12:43 AM
dcdc Well i don't use the fence for any...fencing. It just happens to be what the pin attachment is mounted to for convenience. Nothing ever comes into contact with it.
10-14-2015 12:42 AM
dcdc hah, I guess it could be adjustable in height by just raising the whole pin router attachment thingy up since it is just clamped to the crappy stock fence of the harbor freight table. Still couldnt go down, but 50% is 100% better than 0%...or something.
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