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PostPosted: Tue Aug 07, 2007 10:31 am 
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Cocobolo
Cocobolo

Joined: Tue Nov 07, 2006 9:57 am
Posts: 140
Location: United States
Here's my working prototype of the jig with a brake.
I had found that the advance mechanism sometimes pulled the lining back to the right after the cut, so I added the sliding brake mechanism to hold the lining fast.
The operation is simple, just push, pull, push, pull.
I will probably remake the jig using aluminum and hardwood for better life and accuracy.

Ray


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PostPosted: Tue Aug 07, 2007 4:39 pm 
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Cocobolo
Cocobolo

Joined: Mon Jul 23, 2007 3:46 pm
Posts: 149
Location: United States
Exellent! There is a low speed motor, 60 RPM - used in ice cream makers, Im thinking - fully automated. You can get em for 20 bucks on ebay. Wonder if its possible? All you would need is a "simple" spring and cam setup, and setup to the saw table. 


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PostPosted: Tue Aug 07, 2007 5:35 pm 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Thu Aug 18, 2005 2:21 am
Posts: 2924
Location: Changes when ever I move..Australia
Focus: Build
Status: Amateur
Looks good Ray,

In the tutorial I posted the other day for the Ksled, I included an update sent to me by Daniel Huskey which I think addresses the back-feed problem very well, it is the very last image shown in that post.

Daniels idea is simply a small, secondary spring-loaded pinned arm on the in-feed side of the jig and it should allow back-feed free operation as fast as one can move the jig back and forth with no hold and release technique required.

I have not done the conversion myself as my own jig has a swiveling out-feed guide which is curved to direct the kerfed portion of the lining back away from the neck of my small bandsaw. This curving of the competed strip has that added benefit of providing a little friction to the stock which in turn works to prevent back-feed unless you go crazy fast. However, if it is crazy fast you want, I am certain that Daniels idea would be capable of providing faultless efficiency. (Look out Bob Taylor )

Anyhow, the main point is that the jig works very well no matter the system used because the basic function remains the same. Kudos for that I believe belong entirely to Frank Ford.

Cheers

Kim


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PostPosted: Tue Aug 07, 2007 5:54 pm 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Thu Aug 18, 2005 2:21 am
Posts: 2924
Location: Changes when ever I move..Australia
Focus: Build
Status: Amateur
Just as an aside folks, a back-feed problem can be introduced into the jig if you have the pin which makes contact with the stock in order to advance it across the face plate, either too pointy or at an acute angle.

This pin needs to be beveled or chisel tipped to prevent it from driving into the stock and sticking. If the contact angle of the pin is too great, the action of the jig is inclined to push the stock harder against the faceplate than needed rather than sliding it along the face plate.

The more pressure or friction against the faceplate, the less smoothly the jig will operate and the more chance that the pin will indeed dig in to the stock even with a chisel point. If this happens, it will cause the stock to back-feed rather than slide to where it is meant to be for the next cut.

Cheers

Kim


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