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Drill Press Table #2: Over Engineered ZCI

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Blog entry by Jon3 posted 06-10-2009 03:49 PM 1449 reads 1 time favorited 5 comments Add to Favorites Watch
« Part 1: Drill Press Table Build Begins Part 2 of Drill Press Table series Part 3: Going T-Track Crazy »

I must warn you, this post gives you a good view into my skewed mind sometimes when it comes to the off the cuff way I approach the design aspects of projects. I bolted down the new table, and then offset it slightly from where I wanted the final position to be. I’m using a round ZCI, so that I can just turn it slightly, without replacing the whole insert. The idea was completely stolen from a nice fellow on Woodnet whose name I cannot currently remember. I loaded up a circle cutter, picked a fairly random size (bad move #1) and drilled it out a full 3/4” so that I won’t hurt the table too much if I overdrill or forget to set the depth stop in the future.

This gave me a nice clean hole.

Of course, now I realized I’ve got to figure out a way to make a nice perfect circular insert. In retrospect, If I had made a round template to start, I could have cut both the ZCIs and the hole in the table quite simply. So I had to work backwards and make a template based on an existing hole…

So, I started with a quick hardboard template, so I don’t have to muscle the table around the shop. One hand router and a flush cut template bit later…

Then, to actually USE the template, I needed to add double collar size of the template system to the size of the template, which the rabbeting bit provided quite handily. (Original template double stick taped to template #2)

With this, I was able to cut out a couple of sample ZCIs quite easily. I wanted them to rotate with only finger pressure, so I did sand the edges down a bit on the first one.

The plain MDF edge of the table wasn’t very pretty though. I decided to use some scrap sapele to band the table. A few mitre cuts later, I clamped it in place. I think this may be the first time I’ve ever actually hit a nice tight mitre fit on the first try. I glued it in place and called it a night.



5 comments so far

View PurpLev's profile

PurpLev

8523 posts in 3108 days


#1 posted 06-10-2009 04:19 PM

I know it’s too late – but why not forgo the round hole and go square? making a new square insert is an easy task anytime in the future. although that would make it kinda square…lol ;)

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View Jon3's profile

Jon3

495 posts in 3565 days


#2 posted 06-10-2009 04:28 PM

With a round hole, I can just turn the ZCI clockwise or counter a little bit, and I’m all set. With a square ZCI, you’ve got 4 turns and you’re done.

View Dusty56's profile

Dusty56

11806 posts in 3147 days


#3 posted 06-11-2009 01:42 AM

? We are talking about a drill press aren’t we ? Are you going to drill each hole off center to take advantage of your circlular insert ? I guess I’m lost regarding the logic behind your idea. Can you explain it to a newbie ,please? thank you.

-- I'm absolutely positive that I couldn't be more uncertain!

View Jon3's profile

Jon3

495 posts in 3565 days


#4 posted 06-11-2009 01:44 AM

Dusty, the hole in the table isn’t centered around the bit. With the table bolted in place, the bit is about 1” from the edge. You don’t move the table, or drill off center, you just rotate the round zci a little bit and you’ve got fresh backing.

Peek at the photo of the finished table, you’ll see the first hole already used =)

View Dusty56's profile

Dusty56

11806 posts in 3147 days


#5 posted 06-11-2009 01:48 AM

Ok , thank you Jon3 : )

-- I'm absolutely positive that I couldn't be more uncertain!

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