Author Topic: My oddball project  (Read 6944 times)

Offline Chuck in E. TN

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My oddball project
« on: August 11, 2013, 02:33:50 PM »
 I have seen many extol the virtues of collets and collet blocks for various operations. I only have R8 collets. Quite a while ago I asked on several forums about the possibility  of making R8 collet blocks for Hex and Square features. I mostly got giggles, ridicule, and in general laughed at.
Then, a fella called Davyboy just went ahead and made some. Some folks even applauded the idea. Then the subject of dividing/indexing heads cropped up.  This reawakened in me the interest in R8 collet blocks, and spindles.
I decided to go ahead and make an R8 collet block for several reasons. I wanted to, I had a use for one, and making a collet block would be a good practice for making a spindle, whatever the taper.
So, over the last couple of days, I set about measuring, studying, researching, and finally making a R8 collet block.
My collet block started out as a piece of 1 ½” brass Hex. Why brass? I was the only material I had that was big enough to make a R8 collet with, that stood a chance of being useful.
First I cut a 4 ½” length of the brass hex, and faced the ends. As my 3” chuck was near its limit chucking the 1 ½” hex, and only with the outside jaws, I turned 1 ¼” of one end round, allowing me to use my 4” 4 jaw self centering chuck to hold it. I drilled it through  7/16”, bored to a close fit on the R8 collets, and then bored the 16° 51’ closing angle. I added a pin to fit the key slot on the collets. I even had to make the closing bolt as I didn’t have a 7/16 x 20 bolt in my collection, and I wasn’t going to town for one bolt. I turned down and single point threaded a bigger bolt I did have.
As I was drilling the hole for the key pin, I realized I would not be able to mill square from round stock. I milled ½” wide flats on 2 opposite sides of the hex, effectively giving me  the ability to create squares on round stock.
All in all, I made a tool that may not last as long as I do, and may not get a whole lot of use. But, I did it. I gained invaluable experience to guide me in making an R8 spindle for the Dividing/Indexing head when I make it. It also showed me the limitations of some of my tools, and how to work around them.
Pictures here: http://s571.photobucket.com/user/chucketn/library/R8%20Collet%20Block
Chuck
Chuck in E. TN
Famous TN last words: "Hey ya'll, watch this..."
MicroMark 7x14, HF X2 mill, Green 4x6 saw. Harbor Freight 170A mig

Offline porker

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Re: My oddball project
« Reply #1 on: August 11, 2013, 03:36:10 PM »
Hi Chuck,
This looks to be a great idea. I see now that you can get ER collet blocks which I have been thinking about but as I only have R8 collets at the moment I may have a go at this myself as I have a big chunk of hex brass too. I know I will be limited to bar that I have a collet for (unlike ER collets which have a range) but for most of what I do I have standardised on my stock sizes.
Matt

Offline Charger

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Re: My oddball project
« Reply #2 on: August 11, 2013, 03:47:28 PM »
I have been thinking about making a collet block for van norman 5v or 4ns rivett as they are the collets i have on hand have a van norman#6 mill and it came with both sets of collets

How well does the diy collet block work?

Offline Chuck in E. TN

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Re: My oddball project
« Reply #3 on: August 11, 2013, 06:25:05 PM »
I have been thinking about making a collet block for van norman 5v or 4ns rivett as they are the collets i have on hand have a van norman#6 mill and it came with both sets of collets

How well does the diy collet block work?
I'll let you know how well it works as soon as I get some 1/2" bar for my next project.
Chuck
« Last Edit: August 12, 2013, 01:14:42 PM by Chuck in E. TN »
Chuck in E. TN
Famous TN last words: "Hey ya'll, watch this..."
MicroMark 7x14, HF X2 mill, Green 4x6 saw. Harbor Freight 170A mig

Offline 75Plus

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Re: My oddball project
« Reply #4 on: August 11, 2013, 10:16:07 PM »
Similar project here.

http://madmodder.net/index.php/topic,4474.msg49168.html#msg49168

Works fine for what it was designed to do.

Joe

Offline ieezitin

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Re: My oddball project
« Reply #5 on: August 12, 2013, 12:06:45 PM »
Great job chuck!!!!!!


Personally i never realized they never made collet blocks for R8........ got me thinking about making a set myself...... i love the way R8 collets draw tight..

Very useful...

Anthony.
If you cant fix it, get another hobby.

Offline Chuck in E. TN

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Re: My oddball project
« Reply #6 on: August 12, 2013, 01:22:11 PM »
I save all my various pieces of round stock. When they get real short, the R8 collet will be handy for using them!
Chuck
Chuck in E. TN
Famous TN last words: "Hey ya'll, watch this..."
MicroMark 7x14, HF X2 mill, Green 4x6 saw. Harbor Freight 170A mig