Niggling hole cutter issue - Router Forums
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post #1 of 15 (permalink) Old 07-16-2009, 11:17 AM Thread Starter
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Default Niggling hole cutter issue

I've got 2 sets of hole cutters (they come in different sizes and are used to bore large diameter holes in wood, such as for door knobs). Not sure what they're called.

Anyway, they wobble or jiggle. Both sets. Both on my drill press and in my power drill.

I can still make holes. However, the jiggling probably makes the hole not quite true.

Any suggestions would be helpful. I have ensured the chuck is set tight and the hex holding the drill is tight and the nut holding the cutter to the drill is tight, and so on and so forth.
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post #2 of 15 (permalink) Old 07-16-2009, 11:39 AM
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hi David,
i have 3 inexpensive sets of holesaws from Harbor freight. i have no problem with them. the only thing i can see is the arbor has 3 flat sides on it and the chuck has 3 fingers or jaws that hold a bit. im just wondering if you might need to turn the bit a little in the chuck ? do you see what im saying? im just guessing, im no pro, lol

p.s. if they jiggle and are loose something is wrong with them or they way they are put together.

im not sure if they wobble or jiggle, two important differences

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post #3 of 15 (permalink) Old 07-16-2009, 11:50 AM Thread Starter
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Hi Levon,

You'd think 2 different sets using 2 types of drills would not produce these same results.

Anyway, I think you're on to something regarding the sides mating with the jaws. That's the other possible problem. When reaming a deep hole (like I had to do to route the bathroom ductwork outside the house), there's tremendous force on the drill's chuck, even when tightly set. I'm hoping I don't eventually strip the chuck.

But then again, I'm thinking replacment chucks are cheap?

Also, I may need to look into the possibility that there are different chucks, sort of like they have on lathes.

Thanks
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post #4 of 15 (permalink) Old 07-17-2009, 08:55 AM
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You didn't say what size the holes are David, hole saws, other than expensive bi-metal ones are, in my opinion next to useless. Depending on size and location I would consider either a Forstner style bit which are readily available up to 3 1/4" dia. and can be had up to 4" but must be used in a drill press or I would consider routing using a circle cutting jig, a makeshift one being quick and simple to make.

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post #5 of 15 (permalink) Old 07-17-2009, 09:01 AM Thread Starter
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Thanks, Harry, I think you hit upon some other solutions. BTW, I tested all of the hole bits. Also, as I've never used a Forstner, I'm not sure what type of cylindrical plug they'd produce. I'm guessing people use Forstners for the holes, not the plugs.
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post #6 of 15 (permalink) Old 07-17-2009, 09:08 AM
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hi David

a forstner bit wont produce a plug, only thin ribbons. it is for holes and is a great tool for various types of holes.

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post #7 of 15 (permalink) Old 07-17-2009, 09:12 AM
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Ah, I didn't realise that it's the plug that you want, how many do you intend to make and what is the diameter, that will determine what further advice I can give you David.

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post #8 of 15 (permalink) Old 07-17-2009, 09:25 AM Thread Starter
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I've produced the plugs already; they are pictured here:

http://www.routerforums.com/jigs-fix...r-skiis-4.html

They didn't require any particular level of precision. I was just thinking that for a future project, I'd need to be much more precise. Of course a lathe would be nice, if I had the space and money, but as someone mentioned, I could just route whatever size cylinder I need using a jig.

But thanks
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post #9 of 15 (permalink) Old 07-17-2009, 09:58 AM
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I have an inexpensive pair of Bosch multi blade hole saws. They rattle but the cut. I have a number of Starrett hole saws. They cut really well, but slowly. A BIG collet on the hole saw will generally ensure quality. Cut oversize. Mount the "wheel disc" on a mandrill. Chuck in a drill and sand to size. I have a lathe so no problems for me.
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post #10 of 15 (permalink) Old 07-17-2009, 10:37 AM
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I too have Starretts, but aren't they intended primarily for cutting metal?
For cutting wood I've much coarser toothed, German, Austrian and Chinese jobs, although they all seem to use similar pilot holders, albeit that there is a lot of difference between the Chinese ones and the Starrett ones in terms of quality!
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