Horizontal slot mortising: Variable speed important? - Router Forums
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post #1 of 4 (permalink) Old 05-07-2012, 10:43 PM Thread Starter
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Default Horizontal slot mortising: Variable speed important?

Hello All:
I have been reworking my slot mortiser with a new vertical travel mechanism and I am deciding which of my routers to install. I have two Bosch 1617 routers and one of them is variable speed. How important is it to have variable speed in this application? Also, if its important, why? If it helps, I usually use spiral end mills (dirt cheap on ebay) as cutters and also have a few true router bits. Range of sizes is 1/4 to 1/2". If the fixed speed is fine that would free up the VS for other tasks. Yes I could switch the routers out from time to time but its not very convenient with the way it all goes together and I would prefer to just set one in and leave it.

Last edited by TanOak; 05-07-2012 at 10:55 PM.
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post #2 of 4 (permalink) Old 05-07-2012, 11:30 PM
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Changing the RPM is just one of several ways to 'slow down' (or speed up!) a cut.

Depth of cut can be adjusted, rate of feed, and in some situations, a smaller or larger diameter cutter can be used to try and fix whatever isn't right about the cut.

Sometimes RPM is exactly what needs to be adjusted and sometimes it doesn't have anything to do with it.

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post #3 of 4 (permalink) Old 05-08-2012, 06:53 AM
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I agree, Usually if you are mortising, you're not using a large diameter bit, so bit speed isn't a huge concern. Find a speed that seems to work and leave it there, take several light passes and you'll be OK.

Nice looking machine!

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post #4 of 4 (permalink) Old 05-08-2012, 08:10 PM
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Router speed is probably a lot less important than feed speed. As Doug said, the bits are relatively small so full speed shouldn't be a problem.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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