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post #1 of 4 (permalink) Old 12-17-2010, 09:42 AM Thread Starter
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Default Jasper Base Plates

I put one of these on my Bosch 1617 so I can use PC guides. The plate went on and the HF guides fit well. However, the bits are not centered. As my skill level is minimal I'm not too concerned at the moment but it does give me cause for concern, especially since I can't use the smallest guides on the appropriate bits.

I'm still having problems switching between the fixed base and the plunge base. Makes me wonder about putting this on CraigsList and getting something newer.

Any ideas?

Thanks,
Burt
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post #2 of 4 (permalink) Old 12-17-2010, 10:21 AM
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Originally Posted by Zurt View Post
I put one of these on my Bosch 1617 so I can use PC guides. The plate went on and the HF guides fit well. However, the bits are not centered. As my skill level is minimal I'm not too concerned at the moment but it does give me cause for concern, especially since I can't use the smallest guides on the appropriate bits.

I'm still having problems switching between the fixed base and the plunge base. Makes me wonder about putting this on CraigsList and getting something newer.

Any ideas?

Thanks,
Burt
Hi Burt - Are you using counter sunk flat head screws or counter bored pan head screws to hold the base on?
Makes a difference as the tapered flat head screws don't allow any movement of the base plate to adjust centering. Rather, they will pull the base off center when tightened if the screw holes aren't dead bang on.
If you can tighten the base plate without it moving on you, just chuck up a 1/4" bit and install a 5/16" bushing with the base loose and tighten it down. 5/16" bushing will have a 1/4" ID so will keep the base centered.
If you are using the counter sunk flat heads, use a forstner bit slightly larger than the head size of the pan head screws and put a flat bottom counter bore on each of the holes.
I would be surprised if Jasper predrilled for countersinks though. I have their circle jig and it was predrilled with counter bores.

John Schaben

The problem with experience is I usually get it immediately after I need it.
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post #3 of 4 (permalink) Old 12-17-2010, 02:04 PM Thread Starter
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John,
I used the original Bosch counter sunk screws as none of the Jasper screws would fit. There wasn't any play. It was a dead on fit.
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post #4 of 4 (permalink) Old 12-17-2010, 05:54 PM
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John,
I used the original Bosch counter sunk screws as none of the Jasper screws would fit. There wasn't any play. It was a dead on fit.
Did the Jasper plate have flat bottom holes? If so, replace with pan head, you may need to deepen the hole slightly, I think I had to do that on the Jasper 400 jig I have. There should be enough slop in the holes to allow you to center the plate. Likely the holes in the base are slightly off but within bosch tolerance.

John Schaben

The problem with experience is I usually get it immediately after I need it.
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