[pianotech] pinblock drilling clamp

[tnrwim at aol.com]

Some folks complain about pictures placed in forum posts. My complaint is a lack of pictures. My limited cranial capacity will not form a workable picture of what is described below. If the dowel is bolted to the depth guide, won't the dowel advance downward at the same rate as the drill bit? How does that "release the bit"? Sorry, just can't picture what this dowel is doing.


Terry Farrell

Terry

I don't completely understand why it happens, but when the dowel, which does come down at the same rate as the drill bit, contacts the pin block, it "releases" the drill bit, and allows it to come back out of the block. 

The dowel is about 6" long. To make sure it does it's job, before I start drilling, I lower the drill to the side of the block, and look to see that the bit is about 1/8" past the bottom of the block. That's the point the dowel should touch the top of the block. When each hole is drilled, when the bit goes through the bottom of the block, that's the point at which to dowel hits the top of the block. The drill is brought back up, and the block stays where it is, without having to hold on to it, or clamp it down.  

Wim






-----Original Message-----
From: Terry Farrell <mfarrel2 at tampabay.rr.com>
To: pianotech <pianotech at ptg.org>
Sent: Wed, Aug 11, 2010 11:53 pm
Subject: Re: [pianotech] pinblock drilling clamp


Some folks complain about pictures placed in forum posts. My complaint is a lack of pictures. My limited cranial capacity will not form a workable picture of what is described below. If the dowel is bolted to the depth guide, won't the dowel advance downward at the same rate as the drill bit? How does that "release the bit"? Sorry, just can't picture what this dowel is doing.


Terry Farrell


On Aug 12, 2010, at 3:55 AM, tnrwim at aol.com wrote:



I had the same problem you describe, the pin block riding up on the bit. I used to hold the block down with my forearm, but that seriously bruised it. What I wound up doing is attaching a dowel to the guide, which on your press is to the left of the chuck. I drilled a 5/8" hole in one end of a 3/4" dowel, and attached a 5/8" diameter T-Nut. On the guide, I put a 5'8" bolt, and screwed the dowel to the bolt. The dowel is long enough so that when the drill is all the way through the block, the bottom of the dowel would hit the pin block. That would release the bit, and you're ready to drill the next hole.  No clamp to tighten and release, and no bruised forearm.  
Wim







-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100812/221f7a78/attachment.htm>