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Another question: Router Guide bushing

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Forum topic by edwood1975 posted 10-08-2015 05:57 PM 473 views 0 times favorited 9 replies Add to Favorites Watch
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edwood1975

492 posts in 804 days


10-08-2015 05:57 PM

I’m really out of my element with this type of routing so I gave a question..

I want to cut box joints 1/2” wide x 3/4” high.. I’m using a 1/2” diameter straight bit and the bit has a cutting depth of 1”.

So my question is what size bushing do I need to keep all my box joints uniform in height?

Sorry to be a pain this week but I’m trying to break my comfort zone and it’s a little hard!!!!

-- Ed


9 replies so far

View Ocelot's profile

Ocelot

1470 posts in 2099 days


#1 posted 10-08-2015 06:09 PM

So the fingers are 1/2”? If it’s 3/4” high you only have one finger on one side and 2 half fingers on the other. Probably I’m not understanding what you are doing. Could you explain more? A photo of a hand-drawn sketch would help.

What template are you using? Are you using a dovetail jig?

-Paul

View Fred Hargis's profile

Fred Hargis

3930 posts in 1954 days


#2 posted 10-08-2015 06:10 PM

I’m puzzled by why you would need a bushing at all. Is the design of your jig such that you have to use one?

-- Our village hasn't lost it's idiot, he was elected to congress.

View edwood1975's profile

edwood1975

492 posts in 804 days


#3 posted 10-08-2015 06:17 PM



So the fingers are 1/2”? If it s 3/4” high you only have one finger on one side and 2 half fingers on the other. Probably I m not understanding what you are doing. Could you explain more? A photo of a hand-drawn sketch would help.

What template are you using? Are you using a dovetail jig?

-Paul

- Ocelot

I’m using a box joint jig with 1/2” key on my router table..

To be honest I’m not in a project yet as i want to get my setup squared away .. I haven’t decided what project I’ll be doing .. Probably a box of some kind..

I was thinking that a bushing would take out all the measuring that I would need to do to achieve uniformed slots and fingers

-- Ed

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edwood1975

492 posts in 804 days


#4 posted 10-08-2015 06:20 PM



I m puzzled by why you would need a bushing at all. Is the design of your jig such that you have to use one?

- Fred Hargis

My router table is homemade and it’s extremely difficult in measuring depth cuts with the router I have.. I thought a bushing would set the depth of the cut.. I’ve tried manualy setting the depth of cut and it’s always off 1/16” or 1/8” and read that bushings are used to control the depth of a cut

-- Ed

View bondogaposis's profile

bondogaposis

4024 posts in 1812 days


#5 posted 10-08-2015 06:24 PM

I’m baffled by your description.

So my question is what size bushing do I need to keep all my box joints uniform in height?

The height of the box joint is controlled by the height of the bit, no bushing needed.

-- Bondo Gaposis

View edwood1975's profile

edwood1975

492 posts in 804 days


#6 posted 10-08-2015 06:27 PM



I m baffled by your description.

So my question is what size bushing do I need to keep all my box joints uniform in height?

The height of the box joint is controlled by the height of the bit, no bushing needed.

- bondogaposis

The depth adjustment on my router is extremely hard to adjust to minute increments so as to achieve a uniformed slots and fingers .. I’m trying to explain as best I can.. Outside my comfort zone on this excercise!! Sorry

-- Ed

View MrUnix's profile

MrUnix

4208 posts in 1660 days


#7 posted 10-08-2015 06:28 PM

My router table is homemade and it s extremely difficult in measuring depth cuts with the router I have.. I thought a bushing would set the depth of the cut.. I ve tried manualy setting the depth of cut and it s always off 1/16” or 1/8” and read that bushings are used to control the depth of a cut.

I’ve never heard of using bushings to set the depth of cut, and can’t even think how that would be possible – unless your definition of ‘depth of cut’ is different than the norm. Depth of cut is set by raising or lowering the bit relative to the routers base plate… or in the case of a router table, relative to the table top. Bushings are used to follow templates, keeping the bit a fixed distance from the template edge – which has nothing to do with how deep the bit is cutting.

It would help if you post a picture of your current setup so we can see exactly what you are talking about.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View HokieKen's profile

HokieKen

1738 posts in 599 days


#8 posted 10-09-2015 08:42 PM

I’m with everyone else. I think you’re a bit confused by something you’ve read about how a guide bushing works. The only way to adjust the depth of cut is to move the cutter up/down in relation to the table top. If it really is that difficult to set the depth on your router properly, you have a couple of options. (1) You can make a depth setting gauge. Just cut a notch in the corner of a flat piece of wood that’s the depth you need and move your bit to touch it. (2) With box joints, you can leave the pieces a little long and set your cut depth a little deep. Once you’ve cut all the joints, you’ll have overhang at the joints. Just plane/cut/sand it flush. You’re box dimensions won’t be precise but if you make everything else to fit the box, it won’t matter. Just be certain opposed sides start out the same length and use the same depth of cut for all the joints or you’ll end up with a box that’s out of square.

-- Kenny, SW VA, Go Hokies!!!

View edwood1975's profile

edwood1975

492 posts in 804 days


#9 posted 10-09-2015 09:08 PM

Thanks everyon for your input into this question .. I guess I misunderstood the application of a bushing but they do sound very interesting to use with a hand held router …

Thanks again

-- Ed

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