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Subject: Re: Need Long Pattern Bit

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Message Thread:

Need Long Pattern Bit

6/14/17       
Randy Stone Member

Website: http://www.dovetailconstruct.com

I need to cut out some ornate trellis braces out of 6X DF. Was thinking of making a pattern and trimming the rough cut with a pattern bit from both sides. I would need a cutting edge of at least 3" and a bearing on top if possible. Yeah I know scary.

Anybody know where I can get such a beast?

6/14/17       #2: Need Long Pattern Bit ...
Pete D

The longest I've seen in the states has 2 1/2" cut length with top bearing made by yonico. If you're cutting a 6x the actual dimension is closer to 5 1/2", no? If it is, you could probably get another 1/4"+ lowering the bit after the first cut. I'd be sure and rough out the pattern as close as you can on a bandsaw first before flush cutting with a bit that long. There's a few companies that make insert shaper cutters with a bearing that have 3" or longer cut length.

If you don't have a shaper, need 3" cut length and no one else knows of a source in the states you can get one with 75mm cut length from Wealden tool in the U.K.

Wealdentool.com Catalog

6/14/17       #3: Need Long Pattern Bit ...
rich c.

Amana makes a 3" CL, 1/2 shank, 1/2 cutter diameter. Then work off a guide bushing, and wear a flak jacket!

6/15/17       #4: Need Long Pattern Bit ...
Randy Stone Member

Website: http://www.dovetailconstruct.com

Ya, the thought of that much steel spinning at high rpm is a bit scary.

Thanks guys.

6/15/17       #5: Need Long Pattern Bit ...
SG

If you can find a CNC-equipped shop that has a substantial machine and is used to running solid wood, you would better served to let them do it. I just today finished cutting a number of 7 3/8" thick timber brackets on my router, using a helical hogger and 1" end mill. The beauty of the router is that a smart programmer will do end grain first, then run with the grain at all times, which will be esp. helpful on DF. Pre-CNC I did exactly what you are suggesting by hand and it is a sketchy process, and one likely to leave you with imperfect results in such a splinter-prone species.

6/16/17       #6: Need Long Pattern Bit ...
David R Sochar Member

Magnate used to have some long bits for the Legacy decorative lathes they supplied bits for. I have a 4" spiral with 2 bearings on the bottom. Yes, scary stuff.

6/16/17       #7: Need Long Pattern Bit ...
rich c.

That's the first place I look too David, didn't see any in a quick search.

6/18/17       #8: Need Long Pattern Bit ...
Alex Hendrick  Member

I've done this with a 2" flush bit . Make your blanks for lamination to a consistent length and set up a drill press to dowel them part way through say 1/2". The only faces that don't get doweled are the outside show faces. Make a 1/2" pattern, screw to first rough bandsawn piece, flush cut to pattern. Remove 1/2" pattern and hang it on the wall with all the other patterns and jigs that will hopefully get used again someday. Glue and dowel two rough blanks onto the first blank. Now use the first blank as your pattern to flush the new layers. If grain vs direction of cut is a big issue you could just keep adding a single blank to the side with a better grain cutting direction. You'll want to be super close on the bandsaw where the grain runs uphill to the cutter , I tried climb cutting white oak and had some violent and scary things happen, turned out better to feed forward slowly. Alternatively a person could put on a larger bearing, cut close, replace with the right bearing and finish. Let us know how you do.


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