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Discussion Starter · #1 · (Edited)
Hi all,
I have also drilled pen blanks using a drill chuck attached to a radial arm saw (RAS).

An advantage is being able to use a longer drill bit because of the long parallel travel of the motor.
A disadvantage is that the drill chuck would only take up to 8 mm pen drilling bits.
I could not find a larger drill chuck that would fit on the threaded motor shaft on my RAS made in 1973.
The motor runs at 3450 rpm, so the safety minded workers should be happy.

Attached are a series of images that show the layout.

In the pictures, nothing is shown attached to the saw.
The drill vise holding the pen blank, must be aligned and securely anchored to the table.
=
Mark
 

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Discussion Starter · #3 ·
Thanks for finding those drill chucks on eBay, but the 5/16-24 external post on the chuck that I have is hard to pin down.

The DeWalt ras motorshaft has a 5/16-24 female thread on the accessory end.

Do you know of an "adapter" that I can use to upsize to the chucks you suggested?
It would have to go from 5/16-24 male to 3/8" 24UNF male (or larger) to use the drill chucks on the market. So far I haven't found one.

Thanks again,
Mark
 

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Hi Mark

Sorry I don't off the top of my head
But if you have a lathe or have mate that has one you can make your own easy just pickup a 1/2-20 Allen set and turn the end down to 5/16 and put the threads on it, the 1/2-20 drill chucks are easy to find :)

Or just pickup the chuck below and turn the adapter down on one end to 5/16..
http://www.ebay.com/itm/1-pc-SDS-pl...Tool_Work_Holding&hash=item1e6d7331b5&afsrc=1


==
Thanks for finding those drill chucks on eBay, but the 5/16-24 external post on the chuck that I have is hard to pin down.

The DeWalt ras motorshaft has a 5/16-24 female thread on the accessory end.

Do you know of an "adapter" that I can use to upsize to the chucks you suggested?
It would have to go from 5/16-24 male to 3/8" 24UNF male (or larger) to use the drill chucks on the market. So far I haven't found one.

Thanks again,
Mark
 

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Discussion Starter · #5 ·
Thanks for your good advice.

Thanks for the update.
I took your advice, went to eBay and will machine the end.
I went for the standard chuck as shown in the picture.
Thanks again,
Mark
 

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You're Welcome Mark :)

Here's little tip chuck up a 1/2-20 nut in the lathe ,that way you will not screw up the threads on the adapter but I'm sure you know that :)

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Discussion Starter · #8 ·
lathe chucking using a 1/2-20 nut

You're Welcome Mark

Here's little tip chuck up a 1/2-20 nut in the lathe ,that way you will not screw up the threads on the adapter but I'm sure you know that.
Jigs
=
Thanks for the tip on chucking up a 1/2-20 nut to hold the part for threading.:)
Until you suggested it, it didn't cross my mind that I would have to use extra care.
Doing your way will probably produce Minimum Runout on the new threaded adapter.
=
Mark
 

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RAS to drill! I would have never guessed! Got a couple of old motors- will check to see if they are threaded on the backside.
 
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