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Cutting fins on a router table

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Eekamouse - 12 Jun 2007 23:19 GMT
Anybody here ever use a router with a flush trim bit, to cut
fins from a plywood template?   I would like to hear your
techniques.  I'm trying to make a large quantity of complex
fin shapes, and I think this might be the way to go.
Tom Biasi - 13 Jun 2007 00:52 GMT
> Anybody here ever use a router with a flush trim bit, to cut
> fins from a plywood template?   I would like to hear your
> techniques.  I'm trying to make a large quantity of complex
> fin shapes, and I think this might be the way to go.

It would be best if you had a steel template and could fasten your blanks to
it.
Use a flush bit preferably with a bearing.

Tom
Chuck Rudy - 13 Jun 2007 01:02 GMT
>> Anybody here ever use a router with a flush trim bit, to cut
>> fins from a plywood template?   I would like to hear your
[quoted text clipped - 6 lines]
>
> Tom

I agree with Tom.  Make up one template, fasten it (nail or small screw)
it to a sheet of material you wish to make the fins out of and  use a
top bearing cutter router bit.
http://www.rockler.com/product.cfm?page=5411  and  you can make
thousands provided you don't lose the template.

Good luck.

Chuck
Chuck Rudy - 13 Jun 2007 01:14 GMT
>> Anybody here ever use a router with a flush trim bit, to cut
>> fins from a plywood template?   I would like to hear your
[quoted text clipped - 6 lines]
>
> Tom

I agree with Tom.  Make up one template, fasten it (nail or small screw)
it to a sheet of material you wish to make the fins out of and  use a
top bearing cutter router bit.
http://www.rockler.com/product.cfm?page=5411  and  you can make
thousands provided you don't lose the template.

To use a router table (having the router suspended inverted under the
table-not the fancy smancy program driven table) you would have to cut
every piece on a table/skill saw first then  trim them on the table, a
two step process and possibly having more waste.

Good luck.

Chuck
Eekamouse - 15 Jun 2007 13:41 GMT
Tom/Chuck - thanks for the replies.  I have a flush trim router bit
with the bearing above the cutter.  So I think what I'll do, is make
a plywood template the shape of the fin, screw/glue a couple of
knobs (he said KNOB!) or cabinet handles to it for grips, then glue
a spacer piece to the underside to compensate for the gap
between the bearing and the cutter.  Then stick some 80-grit
sandpaper to the bottom of the spacer, to grip the workpiece (or
maybe use some pointed brads.)
Tom Biasi - 15 Jun 2007 20:59 GMT
> Tom/Chuck - thanks for the replies.  I have a flush trim router bit
> with the bearing above the cutter.  So I think what I'll do, is make
[quoted text clipped - 4 lines]
> sandpaper to the bottom of the spacer, to grip the workpiece (or
> maybe use some pointed brads.)

There should be no gap between the bearing and the cutter, that's why its
called a flush cutter.

Tom
Chuck Rudy - 16 Jun 2007 03:16 GMT
>> Tom/Chuck - thanks for the replies.  I have a flush trim router bit
>> with the bearing above the cutter.  So I think what I'll do, is make
[quoted text clipped - 9 lines]
>
> Tom

Agreed.....it is a flush bit......we use them for churches and high end
offices and some really bizarre millwork.....once it's been run there is
no difference in size, they are exact......as far as depth just drop a
1/4" plywood scrap to keep you from routing your work bench...until
you've made your last pass the piece will not move (though I can
understand putting a piece of sandpaper in between) after you get the
touch.  Just freeze and hit the OFF button and all will be well.  It's
all just a touch of practice.

Chuck
Eekamouse - 24 Jun 2007 14:58 GMT
> There should be no gap between the bearing and the cutter, that's why its called a flush cutter.

Not the diameter, no - I was referring to the vertical distance
between the bearing and the cutting blade.
Smaug Ichorfang - 17 Jun 2007 19:07 GMT
"Eekamouse" <eek@amouse.not> wrote in news:O9-dnS-
_PJFOhvLbnZ2dnUVZ_jWdnZ2d@adelphia.com:

> Anybody here ever use a router with a flush trim bit, to cut
> fins from a plywood template?   I would like to hear your
> techniques.  I'm trying to make a large quantity of complex
> fin shapes, and I think this might be the way to go.

As described in prior messages, you can use *either* a table ans end-
bearing bit or a top bearing/collar.  With either method you can cut single
fins or multiples at one time.  Two other ways that do not require a solid
template are a duplicarver (or similar machine), or a duplicating
pantograph.  With one of these, you can work from a flat drawing.
 
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