Author Topic: _small_ carbide drill bits  (Read 1620 times)

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RS-27

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_small_ carbide drill bits
« on: April 14, 2007, 02:37:31 AM »
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I've been using them for the past 15 years and think they are great.

If they have the plastic ring they can be used without a pinvise but are best used in a drill press.

That said, the real reason for the post is for the already converted.  (Try them, you might like them.)

I have about 150 in 80 different sizes, numbered and metric, that were bought in random assortments.  I'm always looking to fill the gaps, especially with the metric sizes.   

I bought a 20 pack at Harbor Freight today: #44924 for $5.49.  That is about 23 cents each.

Opened it tonight, seven of them are sub #80:   
1 #87 (0.010")
4 #85 (0.011")
2  0.30mm (0.0118")(between #83-#84)

3  0.34mm (0.0134")(slightly smaller than #80)
3  0.35mm  (0.0138")(slightly larger than #80)
1 #79 (0.0145")
1  0.45mm  (0.0177")(slightly smaller than #77)

The package says 0.032" to 0.128"...  don't believe it, the largest was a #68  0.031".

So if you've been looking for _really_small_ bits and have a HF near you, check it out.  The easy way to check for the tiny bits is they usually have two step reduction from the 1/8" shank.  YMMV, but I may stop in tomorrow to check out the other packages.

Bob in IDaho

Chris333

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Re: _small_ carbide drill bits
« Reply #1 on: April 14, 2007, 06:24:40 AM »
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I've always wanted to try them, but didn't because they are supposed to break easy.  I finally pick up one to try at a local show, it broke the first hole I tried to drill and it was in soft resin.

I'll stick with regular drills for now.

Sokramiketes

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Re: _small_ carbide drill bits
« Reply #2 on: April 14, 2007, 10:29:29 AM »
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Yeah, heed Bob's warning... these are for drill press or mill work only.  Carbide is strong, but very brittle.  Trying to use them in a pin vise takes a whole lot of talent, as once you bend them a little off center, they will snap.  And once they break off flush in plastic, good luck extracting them.

The high speed steel ones are much more forgiving, as they bend.  Use these for hand work.  Smallest is #80 usually though.

For smaller wire details, sharpen a piece of music wire of an appropriate diameter.  My friend Vince put me on to this... he was putting .004" drop grabs (made from guitar string) on an Atlas C628.  He said the Atlas plastic was great, in that a stubby, sharpened piece of the music wire, mounted in a handle or pin vise, could be used to pierce the plastic and make a hole.  No drilling motion is even necessary, just align and shove it through.  Perfect size holes, and it sounded like there wasn't really even a need to glue.  Just push the drop grabs into the newly pierced holes, and friction held them in place.  Once the layer of paint was on, they weren't going anywhere.
 
Mike

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Chris333

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Re: _small_ carbide drill bits
« Reply #3 on: April 14, 2007, 10:43:55 AM »
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What pin vise will hold .004" wire? Most have trouble grabbing #80 bits.

I ask because I could use a new one.

railspike55

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Re: _small_ carbide drill bits
« Reply #4 on: April 14, 2007, 11:25:59 AM »
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Chris333

http://www.walthers.com/exec/productinfo/230-811

I have two of these from mascot.

I am not sure if these new ones have the X in end of the jaws. If they do it will hold a #90.

I found mine a tool show at the local firehall.

Ron N.
Steam and Diesel in Transition

Ron N.

Sokramiketes

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Re: _small_ carbide drill bits
« Reply #5 on: April 14, 2007, 11:46:24 AM »
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What pin vise will hold .004" wire? Most have trouble grabbing #80 bits.

I ask because I could use a new one.

None.  I just fold a tiny piece of masking tape on the end of my #80's, like a flag.  The flag then fits in one cross slot in a 4-jaw chuck.
Mike

www.modutrak.com
Better modeling through peer pressure...