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Guide bushing centered but hole is not

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Forum topic by vicjs posted 05-09-2016 02:37 AM 484 views 0 times favorited 7 replies Add to Favorites Watch
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vicjs

5 posts in 214 days


05-09-2016 02:37 AM

Topic tags/keywords: router question guide bushing

I have a Bosch 1617EVSPK ,used as a plunge router,and noticed that the negative or hole I cut using a template is not centered in the template. The situation gets better if I hold the router handles 180 degrees from my first pass. I set the bushing up using an alignment mandrel that came with a router inlay kit. The mandrel fit snugly in the bushing. The bit appears to be centered in the guide bushing and did not tear up the bushing using a bit a 1/32 smaller the the bushing’s ID (sweated doing that though). Not sure what is happening but I did not have this problem 6 months ago. Am installing sewing machine style hinges on a butlers table and would like to use the templates I made previously to complete the project but don’t trust the router to provide a tight fitting mortise.
Thanks for any ideas.
Photos show cutter blades rotated 180 degrees against a clamped down square.
https://www.flickr.com/photos/141766722@N06/shares/9MkGQn
https://www.flickr.com/photos/141766722@N06/shares/m0UZes


7 replies so far

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BurtC

101 posts in 2593 days


#1 posted 05-09-2016 04:18 AM

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vicjs

5 posts in 214 days


#2 posted 05-09-2016 04:33 AM

I also checked with my centering cone and it matched with the inlay kit mandrel. I guess I stayed with the mandrel because I could spin it around rapidly without wrecking the bushing and because it fits snugly in the bushing. Thanks for the link.

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vicjs

5 posts in 214 days


#3 posted 05-09-2016 04:34 AM

I also checked with my centering cone and it matched with the inlay kit mandrel. I guess I stayed with the mandrel because I could spin it around rapidly without wrecking the bushing and because it fits snugly in the bushing. Thanks for the link.

View shipwright's profile

shipwright

7168 posts in 2261 days


#4 posted 05-09-2016 01:59 PM

There will be some play in your plunge function. Try it with the fixed base if you have it and just tip the router into position. I have that router and always use the fixed base with inlay bushings.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View pintodeluxe's profile

pintodeluxe

4854 posts in 2277 days


#5 posted 05-09-2016 03:56 PM

If you can turn the router 180 degrees, and alignment is different…
1. Sub-base slipped since it was centered.
2. Template slipped from clamps / carpet tape etc.
3. Guide bushing is bent or damaged.
4. O-ring in template bushing is worn or missing. This is what holds the ring on the bushing when cutting inlays.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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vicjs

5 posts in 214 days


#6 posted 05-10-2016 10:49 AM



There will be some play in your plunge function. Try it with the fixed base if you have it and just tip the router into position. I have that router and always use the fixed base with inlay bushings.

- shipwright


I will give that a try. My fixed base is mounted on a table right now but will see if that works when I can free it up.

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vicjs

5 posts in 214 days


#7 posted 05-10-2016 11:23 AM



If you can turn the router 180 degrees, and alignment is different…
1. Sub-base slipped since it was centered.
2. Template slipped from clamps / carpet tape etc.
3. Guide bushing is bent or damaged.
4. O-ring in template bushing is worn or missing. This is what holds the ring on the bushing when cutting inlays.

- pintodeluxe


3.Guide bushing is bent or damaged.
I couldn’t see any damage and out of frustration borrowed a set of guides. In the process remounted the collet and base plate. The borrowed guide was right on. Tried mine and it was not. Problem solved but I can’t figure out what happened to mine that I have had and used for years. What is a joke though is the borrowed set was from Harbor Freight and probably cost a 1/4 of mine. Thanks Willie.

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