longer router bits for loose-tenon mortise cuts with guide bushings? - Router Forums
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post #1 of 12 (permalink) Old 03-15-2014, 03:17 PM Thread Starter
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Default longer router bits for loose-tenon mortise cuts with guide bushings?

I just got a little Dewalt DWP611 router with plunge base which takes guide bushings.

I want to cut mortises for loose tenons. Is there such a thing as an extra-long router bit for this purpose? When the router is fully inserted into the base and can go no further, only 1/2" of cutting edge protrudes beyond the guide bushing.
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post #2 of 12 (permalink) Old 03-15-2014, 04:39 PM
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There are plenty but not for your 1/4" collet (for safe use).
You need a bigger router for blind deep cuts like mortices.
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post #3 of 12 (permalink) Old 03-16-2014, 07:10 AM Thread Starter
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Couldn't the mortise cut be made reasonably safe if the plunge-router's step-turret is used to make the cuts in three or four shallow passes?
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post #4 of 12 (permalink) Old 03-16-2014, 08:00 AM
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I think it is one of those "can I do it" vs "should I do it" things.

If you plan to do this very often you really should move up to half inch and the largest diameter you can use. Then apply the same practice you suggest for the 1/4 bit.

Eventually a bit will break, so approach every operation like this is the time it is going to happen and try real hard to not do anything that will make it more likely to happen.

I appreciate you posting this question. I've been sitting here thinking about "best practices" in my daily shop operation. One of my kids works for me now and I think it might be time to have another "right tool right job" talk coupled with "complacency kills". I feel sorry for my kids sometimes, but not so sorry that I won't preach another sermon about the dangers of fast spinning whirly steel and carbon things. I should probably do a quick powerpoint with some severed digits pics to drive some points home. Hahaha

Sorry everyone
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post #5 of 12 (permalink) Old 03-16-2014, 09:23 AM
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ghsu2ia3 | eBay

1 PC 1 4" SH 2" Blade Extra Long Straight Router Bit | eBay

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Quote:
Originally Posted by mrblint View Post
I just got a little Dewalt DWP611 router with plunge base which takes guide bushings.

I want to cut mortises for loose tenons. Is there such a thing as an extra-long router bit for this purpose? When the router is fully inserted into the base and can go no further, only 1/2" of cutting edge protrudes beyond the guide bushing.



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post #6 of 12 (permalink) Old 03-16-2014, 10:17 AM
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You haven't said what the shank and blade lengths are Dusty. As for template guides, sure they can be used, but in conjunction with TEMPLATES. Perhaps this simple jig that I made would suit your purpose.
Attached Files
File Type: pdf The simplest dowel.pdf (666.7 KB, 141 views)

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post #7 of 12 (permalink) Old 03-16-2014, 10:41 AM
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A few more ideas.

Сверлока - YouTube

Router bits with shank 1/2" for best mortise.
Work done more safely.
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post #8 of 12 (permalink) Old 03-16-2014, 05:57 PM
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Question

Quote:
Originally Posted by mrblint View Post
I just got a little Dewalt DWP611 router with plunge base which takes guide bushings.

I want to cut mortises for loose tenons. Is there such a thing as an extra-long router bit for this purpose? When the router is fully inserted into the base and can go no further, only 1/2" of cutting edge protrudes beyond the guide bushing.
Try putting the cutter only 1" into the collet to see if you get any more length.

"fully inserted into the base"...does not tell me how far into the collet you are going?

What is the length of the cutter blades?

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Last edited by jw2170; 03-16-2014 at 05:58 PM. Reason: correction
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post #9 of 12 (permalink) Old 03-16-2014, 07:57 PM
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Default Router Bit Selection

Dusty,

When mounting a bit in the collet you should insert it all the way and then pull it back a little. The reason for having a small portion of the shank exposed deals with transfer of heat when the bit is under load. Pulling it out further to gain a little cutting depth may be a trade off for safety and/or snapping a bit that isn't properly supported.

I have also switched to 1/2" shafts from 1/4" which gains strength among other benefits.

Is there a bit more suited to the job. For example you might want to research an upsprial bit as it clears the waste out of the channel as it cuts?

Could you use a drill (press) to clear out most of the mortise and then a router bit to clean the edges?

Just a couple of thoughts.
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post #10 of 12 (permalink) Old 03-17-2014, 07:14 AM
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Every collet that I have tested measures 1" (25mm), therefore as stated in the summary of my recent thread on bit insertion, there is nothing to be gained by inserting the bit any further than 1".

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