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Dentist Drill Help

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Forum topic by racerglen posted 240 days ago 691 views 0 times favorited 13 replies Add to Favorites Watch
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racerglen

2293 posts in 1406 days


240 days ago

Topic tags/keywords: question dentist drill power tool old handpeice

My #2 son gave me an old Emco dentist’s drill, motor and everything is fine and my dentist showed me how to put bits in, but the max size is 7/64ths, leaving me unable to use anything but the wee bits his predacessor gave me.
I’d like to be able to use the standard 1/8th Dremel type bits for engraving and carving.
Anyone have thoughts on just carefully boring the tip of the handpiece out to an eighth or would that wreck the hand piece ?

Thanks

-- Glen, Vernon B.C. Canada


13 replies so far

View crank49's profile

crank49

3366 posts in 1596 days


#1 posted 240 days ago

I have an old Emco Minimat lathe; bought it around 1975 I think.
Is your machine a drill press or more like a Foredom flex shaft tool?
Or the one with the round belt that runs from pulley to pulley at each joint?

If it’s the last one, perhaps you could replace the handpiece with a modified Foredom handpiece. You would have to figure out a way to put a shaft and pulley on the back end of the handpiece.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View poopiekat's profile

poopiekat

3584 posts in 2360 days


#2 posted 240 days ago

Glen: got a pic of the tool? Is this a flexible cable driven by a motor, or do the bits attach directly to the motor?
Isn’t there a second collet size, like on dremel, and would that collet fit your dental tool?

-- Einstein: "The intuitive mind is a sacred gift, and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift." I'm Poopiekat!!

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racerglen

2293 posts in 1406 days


#3 posted 240 days ago

Crank, It’s the round belt type running pulley to pulley,
PK, I’m not near home or camera, and not aware of any collet, the handpeice is about 5” long just drop the bit in from the busness end and tighten from the other end which brings a shaft down on top of the bit.the shaft has a hole in it that apears to match the hole in the tip..
What suprizes me is as I say I showed it to my dentist and he demo’ed with a bit that fit, and said Dremel would work fine. I’m now wondering if there’s a metric clown loose here, 64th of an inch ?

-- Glen, Vernon B.C. Canada

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racerglen

2293 posts in 1406 days


#4 posted 239 days ago

Pictures..not sure if these will help, but…

!https://s3.amazonaws.com/lumberjocks.com/mybzu0j.jpg
!

-- Glen, Vernon B.C. Canada

View Ripthorn's profile

Ripthorn

746 posts in 1610 days


#5 posted 239 days ago

I would recommend not doing so. You will likely introduce a significant amount of runout trying to drill it out. Most dentists will happily give you their worn out bits that still cut wood quite nicely. I have several out in the shop.

-- Brian T. - Exact science is not an exact science

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racerglen

2293 posts in 1406 days


#6 posted 239 days ago

Thanks Brian, my thought as well, BUT needed some input from the experts..I do have many “worn out” little bits from my dentist,(I think 3/32 shaft ?) it’d just be nice to be able to run the regular type. I will be asking my dentist what’s up at my next (unfortunately too soon) apointment.
He said it was a type of drill he only had a brief aquaintance with, in school, on a plaster head.
Aparently the “girls” as he put it, hated them, hair got snagged in the exposed belt system ;-)

-- Glen, Vernon B.C. Canada

View poopiekat's profile

poopiekat

3584 posts in 2360 days


#7 posted 239 days ago

I was curious, so I checked my old stash of Dremel bits. There are indeed two shank diameters! The more usual 1/8”, and if my micrometer is right, the smaller diameter shank measures .092” which may or may not be of any help to you. Good luck, Glen!!

-- Einstein: "The intuitive mind is a sacred gift, and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift." I'm Poopiekat!!

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racerglen

2293 posts in 1406 days


#8 posted 239 days ago

I thank you PK and Merry Christmas ! Think Dremel lists their smaller bits as 3/32nds the small ones I got from my detist are even smaller than that but they’ll fit the hand peice, Oh well, back in the box til I see the dentist again.

-- Glen, Vernon B.C. Canada

View crank49's profile

crank49

3366 posts in 1596 days


#9 posted 238 days ago

http://www.riogrande.com/Product/AdvantEdge-Wax-Bur-Set/346193?Pos=68
Here is a link to a company I sometimes use for burrs and such for my Foredom handpieces used in jewelry and carving work.

3/32 and 1/8 are the two most common sizes for collets.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View racerglen's profile

racerglen

2293 posts in 1406 days


#10 posted 238 days ago

Thanks Michael ;-)

-- Glen, Vernon B.C. Canada

View dwightjacobson's profile

dwightjacobson

1 post in 232 days


#11 posted 232 days ago

Glen, I’ve got the same question. I was just down in my shop wondering if I should drill out the handpiece to accept the Dremel bits.
I’d be inclined to do it, but I only have the one handpiece and I’m afraid I’ll make it worthless.
That said, I think I understand how the shafts of the bits are held in place.
The inner tube the one that spins has two diameters in its length. The first is the same as the shaft diameter of the dental bits, and the one farther up toward the belt pulley is larger. When the plunger is screwed down tight, there is a floating piece in the tube that must press down and constrict the dental bit against the side walls.
I think that if the lower hole were bored out to the Dremel size, the upper hole will still contain the little floating piece which should provide the same tightening action as it was designed for the dental bits.
I would like to try to find another old handpiece and give it a go.
There should be some of those old handpieces around? Trouble is I only see them for sale with the motors.
I’ll start to keep my eyes peeled for a spare handpiece, then I’m taking it to the drill press.
Let me know if you have any luck,
Dwight

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Planeman40

470 posts in 1386 days


#12 posted 232 days ago

I must say those old dental drills look very ungainly. Obviously made when very small electric motors had little power and larger motors had to be used. I recall a conversation I had with my dentist one time in which I believe he said the hand piece geared up the drill speed considerably. I would love to hear a report on how comfortable it is to work with.

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

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racerglen

2293 posts in 1406 days


#13 posted 232 days ago

Dwight, I’ve seen postings for handpiece repairs and the like, but I’m still looking too .

Pm40 once the arm tensions worked out it’s nice to use, but with the exposed drive belt watch out for long hair, moustashes and beards .even arm hair I’m told.

-- Glen, Vernon B.C. Canada

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