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Lapidary / Gemstone Community Forum
March 18, 2019, 05:27:32 pm
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New pencil air grinder

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Author Topic: New pencil air grinder  (Read 2070 times)
mick B
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« on: January 31, 2012, 02:28:09 pm »

I have had this pencil air grinder for a couple of years, UHT Usio air pencil grinder Japanese made, great little tool, I was given the drum on this by a NZ carver, most of the pro carvers use these in NZ, very light and huge torque for air, max speed of 65000 rpm, very comfortable and light- great feel, I run on my 15 cfm compressor.

Cheers mick B






* air 1.jpg (51.8 KB, 473x481 - viewed 17 times.)

* air 2.jpg (45.74 KB, 491x392 - viewed 14 times.)

* air3..jpg (29.95 KB, 408x352 - viewed 10 times.)

* air 4.jpg (65.36 KB, 699x377 - viewed 18 times.)

* air 5.jpg (42.7 KB, 494x457 - viewed 16 times.)

* air 6.jpg (29.65 KB, 309x330 - viewed 637 times.)
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Bentiron
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« Reply #1 on: January 31, 2012, 02:51:29 pm »

I have one of those pencil grinders that I used to use for chasing my bronze castings, goes to a 140,000 RPM, a really nice tool to have as it is just about like using a pencil. Harbor Freight makes a cheaper version of the tool that only gets to about 60,000 RPM top speed but it is still and OK little tool for  the price. I paid $200 for my pencil grinder in 1967 and now HF is selling theirs for $25, it comes with an oiler and some other do dads too. I bought one and it works OK.
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pete
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« Reply #2 on: January 31, 2012, 03:43:33 pm »

What size is the collet on these devices and is it changeable?
Also, what size compressor do you need to run it?
Pete
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Freeform
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« Reply #3 on: February 01, 2012, 08:43:11 am »

thanks for the info
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rocknroll
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« Reply #4 on: February 01, 2012, 09:26:39 am »

  man,  that's a cool looking piece you're working on!
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Bentiron
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« Reply #5 on: February 02, 2012, 02:09:39 pm »

The thing that is really nice about a high speed tool like this is that it doesn't snag like a lower speed  flex shaft tool. I can imagine that when working on stone with a diamond bit it would be pretty much like working on bronze or like what your dentist experiences when drilling on your teeth. These things are just spinning so fast that it is in fact like drawing with a pencil. I know that when I was chasing bronzes that it was like that, just so easy to work the surface back down to what it should be, even restoring very fine detail with carbide burs without difficulty. I was using a 1-1/2 HP air compressor at the time and had more than enough air. I still have my old tool and it is a precision instrument but the Harbor Freight tool should be able to preform some of the same basic operations. I don't think it will work as hard nor as long but what  would you expect for under $10? It would give you a chance to try a high speed tool to see if it is something you want to invest a large chunk of change in before you go and spend $300 on a tool that will not serve your purposes.
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jackd
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« Reply #6 on: April 17, 2012, 07:28:20 pm »

Mick, that is beautiful. I am trying my first attempt to carving a fish hook out of a piece of Jade, Its a lot harder than i thought. I have a turbo carver 500, rpm no torque.
I see that you carving under water? Maybe that's one thing I am doing wrong , I've been carving dry. I know there must be a lot more to it.
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Ajo
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« Reply #7 on: April 17, 2012, 09:02:23 pm »

That is a great pencil grinder! I think this thread is going to start me on another lapidary obsession. help I have been itching to do some carving. Thank, Eric.
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Eric

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« Reply #8 on: April 18, 2012, 09:59:36 am »


Could you post some more pics of it, as the others were deleted by Admin.....whoever they are lol

TOG
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« Reply #9 on: April 18, 2012, 05:46:58 pm »

I have been looking at some top tier used air pencils on eBay and the prices look pretty good. They have got to be better than the Harbor Freight tool. The prices have ranged from around $35 to $55 for some decent brands of air tools.
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mick B
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« Reply #10 on: August 27, 2012, 04:39:56 am »

Added some new pics. I carved this with my pencil grinder.

Cheers mick B



* triangle.jpg (16.62 KB, 207x229 - viewed 632 times.)
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jakesrocks
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New Toy.


« Reply #11 on: August 27, 2012, 07:54:06 am »

The red thing in this pic is the HF pencil grinder. I use it and the air scribe for cleaning fossils. I've had the HF grinder for about 18 years, and it's still going strong. I just run a couple drops of air tool oil through it before using it.
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« Reply #12 on: August 27, 2012, 08:15:44 am »

I wanna know how you took those first three pictures... thinking13
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« Reply #13 on: August 27, 2012, 08:26:56 am »

Very nice carving Mick. Almost an optical Illusion.  Beautiful color and beautiful design:)
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helens
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« Reply #14 on: August 27, 2012, 10:49:12 am »

Those pictures of the carving are sooo helpful! Gives me an idea how much water to use and where to hold the tools in the water! Thanks for posting them in action Mick!
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