Extension Table And Fence Jig For Drill Press - Router Forums
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post #1 of 24 (permalink) Old 07-20-2012, 05:11 PM Thread Starter
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Default Extension Table And Fence Jig For Drill Press

Hi all,
I was intending to make a jig for my drill press see attached scan.
The design is featured in Woodsmiths Custom Woodworking Shop Built Jigs and Fixtures.
It says, " Install T-nuts. The next step is to install the four T-nuts that will be used later to attach the base to the metal drill press table.
To locate the holes for these T-nuts, start by setting the base on your metal drill press table. Then after marking the location of the holes from underneath the table, drill counterbored shank holes and install the T-nuts. "
My metal table has no through slots or holes in it. Table does have slots but as said not through ones.
Any ideas?
Peter.
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Last edited by Gaia; 07-20-2012 at 05:14 PM.
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post #2 of 24 (permalink) Old 07-20-2012, 05:57 PM
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Quote:
Originally Posted by Gaia View Post
Hi all,
I was intending to make a jig for my drill press see attached scan.
The design is featured in Woodsmiths Custom Woodworking Shop Built Jigs and Fixtures.
It says, " Install T-nuts. The next step is to install the four T-nuts that will be used later to attach the base to the metal drill press table.
To locate the holes for these T-nuts, start by setting the base on your metal drill press table. Then after marking the location of the holes from underneath the table, drill counterbored shank holes and install the T-nuts. "
My metal table has no through slots or holes in it. Table does have slots but as said not through ones.
Any ideas?
Peter.

I am thinking that you have the PC drill press from Lowe's?

If so, I have that same drill press. I drilled four holes through the table into the where the slots are located. I then installed T-nuts into the bottom of the wood drill press table. Next, you can thread the bolts from the bottom of the cast iron drill press table through and into the T-nuts located in the bottom of the wood table. It is stable and secure.

It was really easy to drill the cast iron and tap the holes.

I could probably post some pics in the next day or two.

Good Luck,

Keith
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post #3 of 24 (permalink) Old 07-20-2012, 06:18 PM
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Hi Peter

Will the T-slots accommodate coach bolt heads? If so you could make a sheet material sub-base drilled and counterbored to take the coach bolts, nuts and washers, then mount your jig on top of that sub-base. saw off the protruding ends of the coach bolts if needs be

Regards

Phil

Edit: Snap, Keith!
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post #4 of 24 (permalink) Old 07-20-2012, 07:29 PM
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Peter,

For what it is worth, I would put the t-nuts recessed into the top of the table.

That way, when you tighten the holding bolts, the pressure will pull the t-nuts into the table. If you put the t-nuts on the bottom of the table, the pressure may pull the nuts out of the table.

James
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post #5 of 24 (permalink) Old 07-21-2012, 05:09 AM Thread Starter
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Hi Peter

Will the T-slots accommodate coach bolt heads? If so you could make a sheet material sub-base drilled and counterbored to take the coach bolts, nuts and washers, then mount your jig on top of that sub-base. saw off the protruding ends of the coach bolts if needs be

Regards

Phil

Edit: Snap, Keith!
Um, yes I was thinking of that possibility.
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post #6 of 24 (permalink) Old 07-21-2012, 05:16 AM Thread Starter
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Originally Posted by BigCountry View Post
I am thinking that you have the PC drill press from Lowe's?

If so, I have that same drill press. I drilled four holes through the table into the where the slots are located. I then installed T-nuts into the bottom of the wood drill press table. Next, you can thread the bolts from the bottom of the cast iron drill press table through and into the T-nuts located in the bottom of the wood table. It is stable and secure.

It was really easy to drill the cast iron and tap the holes.

I could probably post some pics in the next day or two.

Good Luck,

Keith
Hi Keith,
No I'm in the UK and I have a new SIP 01434 F20-16 Floor Pillar Drill. I was thinking I could drill through the table, but don't want to drill through it unless I really have to. A local machinist is doing a little job for me at the moment, didn't know if going through cast iron would be hard going, time consuming, you say not. Will think about this possibility. Duh then again, I have the drill press raise the table and position it up on the rack and go through it myself. I think I have a metal cutting bit that will do and I think I can get away using WD 40 as a cutting fluid?
Peter.
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post #7 of 24 (permalink) Old 07-21-2012, 07:55 AM
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Hi Peter

Cast iron is fairly easy to drill, easier than mild steel in many ways, just centre punch the holes and pilot any holes you drill. Use slow speed (500 rpm) and you should be OK. It generates chips rather than the spirals you see when drilling steel or many other metals. Personally I'd try to find a "non-invasive" approach before going into mole mode

Regards

Phil

Last edited by Phil P; 07-21-2012 at 08:00 AM.
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post #8 of 24 (permalink) Old 07-21-2012, 10:04 AM
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Welcome, Peter.
A couple of battens just a tiny bit thinner than your drill press table can be added on either end of your auxiliary table with a wider batten screwed or bolted to that, thus locking down your table.
Don
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post #9 of 24 (permalink) Old 07-21-2012, 11:35 AM Thread Starter
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Originally Posted by Phil P View Post
Hi Peter

Cast iron is fairly easy to drill, easier than mild steel in many ways, just centre punch the holes and pilot any holes you drill. Use slow speed (500 rpm) and you should be OK. It generates chips rather than the spirals you see when drilling steel or many other metals. Personally I'd try to find a "non-invasive" approach before going into mole mode

Regards

Phil
OK, "non-invasive" approach, with you on that. How would I attach the sub base to the table extension base, in a non permanent way? I've only put a little thought into this and the the only thing that springs to mind so far, is nuts, bolts washers counterboring, and then using some type of plug to fill the remaining holes in the extension table base?The cast iron drill bench does have quite big slots that will be fine for bolts washer, nuts.
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post #10 of 24 (permalink) Old 07-21-2012, 11:41 AM Thread Starter
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Peter,

For what it is worth, I would put the t-nuts recessed into the top of the table.

That way, when you tighten the holding bolts, the pressure will pull the t-nuts into the table. If you put the t-nuts on the bottom of the table, the pressure may pull the nuts out of the table.
Thanks James.
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