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Bosch Colt depth slips when routing!😖

1050 Views 12 Replies 6 Participants Last post by  C5-Drammen
When attempting a 1/4” roundover on the components of a cradle I am making, the router depth slipped, creating a 1/16” cut into the parts! I have read the short manual provided and it does not mention method to fasten the router more tightly in the housing! Any advice would help me from continuing my mistake. Thank you.
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First, welcome. Is this the 1hp Colt or the newer slightly larger one.

Meanwhile use a small amount of alcohol or mineral spirits to clean the inside of the base, and the outside of the router. Let it dry thoroughly before using. After cleaning, there is a small nut just beneath the flip handle on my colt, that you can tighten. But don't over-do it. I think its the same on all the colt models.

Are you certain that the base mount slipped, or was it the bit that moved? The bit slipping is a much more likely issue, and means that you need to make sure the collet is a bit tighter. It doesn't take much because the collet is a very precise device. The difference between tight and loose is just a few thousandths of an inch. Also check make sure the bit's shank is clean as well.
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G'day Bob, welcome to the forum.
G'day Bob, welcome to the forum.
Thank you, James!
Welcome to the forum Bob.
Yep. Bit could have slipped, or router could have slipped in the housing. On my Bosch trim router the housing has a cam lever that tightens the router in the housing. If it is loose there is a nut under the lever that can be tightened to increase the grip on the router when the lever is closed. If the bit has slipped, then make sure your collet isn't packet with dust as this will make you think it is tight around the bit when it is only tight with dust. When I change bits I take the collet completely off and tap it on my workbench to to knock out any packed dust.
4D
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First, welcome. Is this the 1hp Colt or the newer slightly larger one.

Meanwhile use a small amount of alcohol or mineral spirits to clean the inside of the base, and the outside of the router. Let it dry thoroughly before using. After cleaning, there is a small nut just beneath the flip handle on my colt, that you can tighten. But don't over-do it. I think its the same on all the colt models.

Are you certain that the base mount slipped, or was it the bit that moved? The bit slipping is a much more likely issue, and means that you need to make sure the collet is a bit tighter. It doesn't take much because the collet is a very precise device. The difference between tight and loose is just a few thousandths of an inch. Also check make sure the bit's shank is clean as well.
First, welcome. Is this the 1hp Colt or the newer slightly larger one.

Meanwhile use a small amount of alcohol or mineral spirits to clean the inside of the base, and the outside of the router. Let it dry thoroughly before using. After cleaning, there is a small nut just beneath the flip handle on my colt, that you can tighten. But don't over-do it. I think its the same on all the colt models.

Are you certain that the base mount slipped, or was it the bit that moved? The bit slipping is a much more likely issue, and means that you need to make sure the collet is a bit tighter. It doesn't take much because the collet is a very precise device. The difference between tight and loose is just a few thousandths of an inch. Also check make sure the bit's shank is clean as well.
Thank you, Tom. I did tighten the nut in the flip fastener and that seemed to solve the problem.
As a note, I decided to use my big router and table to finish the other pieces with great success! Thanks again for your reading and responding to my query!
Yep. Bit could have slipped, or router could have slipped in the housing. On my Bosch trim router the housing has a cam lever that tightens the router in the housing. If it is loose there is a nut under the lever that can be tightened to increase the grip on the router when the lever is closed. If the bit has slipped, then make sure your collet isn't packet with dust as this will make you think it is tight around the bit when it is only tight with dust. When I change bits I take the collet completely off and tap it on my workbench to to knock out any packed dust.
4D
4D,
thank you for your advice. It did turn out to be the nut on the clasp. Turned it a bit and I’m back in business!
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thank you for your advice. It did turn out to be the nut on the clasp. Turned it a bit and I’m back in business!
Good. Thanks for letting us know how it worked, we often offer solutions then never hear from the poster.
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Good. Thanks for letting us know how it worked, we often offer solutions then never hear from the poster.
You’re very welcome. I truly appreciated the responses received from several folks on this router site! Happy Thanksgiving!
You’re very welcome. I truly appreciated the responses received from several folks on this router site! Happy Thanksgiving!
And I hope your holiday is wonderful.
I have the GKF600 - which is the european version of your "colt". I'm not very happy about its adjustment system which I will call total crap. When new it functioned ok, but after a while it start getting useless cause to wood debris in the aluminium threads.The strange thing is when you have adjusted needed depth, as soon you tighten its clip, it get just a bit out of correct depth. So my only solution here is to either use a caliper or use Trend's depth gauge to make sure you get the correct depth - means some "microadjusting" manually. I am about thinking to replace my GKF with a Makita. Not sure if its better but Makita has always make similar good tools. Even much of its accessories are utter useless, notably the extra plate to connect to vaccum. Once to use that plate, you cant use any other usefull accesory...
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I have the GKF600 - which is the european version of your "colt". I'm not very happy about its adjustment system which I will call total crap. When new it functioned ok, but after a while it start getting useless cause to wood debris in the aluminium threads.The strange thing is when you have adjusted needed depth, as soon you tighten its clip, it get just a bit out of correct depth. So my only solution here is to either use a caliper or use Trend's depth gauge to make sure you get the correct depth - means some "microadjusting" manually. I am about thinking to replace my GKF with a Makita. Not sure if its better but Makita has always make similar good tools. Even much of its accessories are utter useless, notably the extra plate to connect to vaccum. Once to use that plate, you cant use any other usefull accesory...
I did figure out I needed to tighten the nut on the clip you flip to anchor the router in the housing. That took care of the “creep” I was experiencing in the depth of cut. Just frustrating when you ruin a portion of the project that requires significant time and effort to correct! Thank you for your input and I would be furious to hear how the Makita works out for you if you decide to get one. Again, thanks for your comments.👍
Thank you very much. I will check that nut you mentioned.
My advice is - keep the threads clean but even the paralell-guide in my opinion has a flaw ; the gap between that guides - for giving the router bit clearance is too large. I tried using a 19mm straight bit on it, and you end up with a certain vibration after starting it which means its oversized for the router.
If you want to rout a smaller piece, its almost certain you will miss the straight cut. the remedy here is to screw a straight piece of wood on the guide which makes routing free from hassles.
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