Router Speed Controls - Comments

Any experience with the stand-alone router speed controls? I have a 2-year old single speed Bosch 1617, love it and I don't want to replace it. I would, however, like the capability to control the speed and the stand-alone controllers look like a good investment.
Only concern - Is any compromise on the router motor,or internal circuitry from a reliability standpoint? I don't want to cook my Bosch.
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really big panel-raisers, but never got around to actually forking over the cash for the panel-raiser. It works well enough - I have also used it with a belt sander, and my jointer has a universal motor, so I've used it with that, too. The only thing I'd imagine you have to watch out for is the amperage draw of whatever you're plugging into it.
HB
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Ron, I'm not trying to put you off, but I think there's a wealth of experience and comment in Google group archives on this topic, including comments on use with specific routers. I'd recommend you comb the previous posts to get the info in a much shorter time.
Go to http://groups-beta.google.com/group/rec.woodworking and search for "router speed control".
Bob
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wrote:

I have played with one of those before. I found it was 'searching' in a pulse-like fashion for a speed to settle into when it was not under load. Motor fans are sized for optimum airflow at a specific RPM. In the case of single speed, they're optimized for maximum RPM. EVS devices are 'fanned' for lower RPM and loads. Your Bosch, or any single speed device, wouldn't be blowing the same amount of air at lower RPM even though the load could be generating a shitload* of heat. That lower airflow may still be adequate, just that we don't know for sure, eh? I'm sure that with the smaller bits it wouldn't be cause for concern, but those horizontal raised panel bits?
*shitload = Canadian term for 'a lot'. May be metric.
Rob
"Common sense is not common" (Voltaire)
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Replace? <G>
More than one router is not a bad thing...
Barry
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In fact I own two now including the Bosch and an old Craftsman that does OK. I do plan to buy one of the BIG MOMMA's for a router table later on. I have been seeing the speed controls in the $30 range and thought it would help for now. However, based on some good comments I have received here, I am going to hold the speed control capability off until I acquire big momma.
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I have use the external variable speed units. IMHO they do what they are suppose to do but unlike many routers with built in variable speed they do not maintain the router speed under a load. Typically the router with the built in variable speed has feed back and will maintain speed under load to a greater degree.
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