[pianotech] pinblock drilling clamp

[Terry Farrell]

Thanks. Now I can picture it.

Terry Farrell

On Aug 12, 2010, at 2:22 PM, tnrwim at aol.com wrote:

>
> 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
>

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