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Old 09-11-2007, 06:45 AM   #1 (permalink)
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Default Holesaw segmenting in plastics

Here's a trick I used to make a recent pen. I wanted to have a round segment in the main body of the material. I selected two holesaws, one the next size to the other. The smaller one will make the cutout in the main body and the larger one cuts the segment that will get glued in. ( using the outside of the kerf of the small one and the inside kerf of the bigger one) Even doing this leaves a gap, so I just lightly held the matching parts in a vice and slowly heated the joint with a heat gun ( on low ) As the plastics start to get soft, gently close the vice while still warming the bits. (I also warmed up the vice and bit of steel) Leave it in the vice till it's COMPLETELY cold.

These are the two pairs of similar holesaws, 1 pair for the body and the other for the cap

Here I am cutting the segment using the larger holesaw from each pair. I left the pilot bit out.

Here you can see that even using matching holesaws, the gap is too big

Holding it the vice and heat it up while gently closing the vice. ( I also sanded most of the rough marks off that were caused by the holesaws) The segment was wider than the vice jaw, so I just added the chuck of metal. I concentrated the heat on this bit of metal. Leave it in the vice till it's cold.

Here's the pen again, no visible glueline:D

I have used this method when segmenting plastics into wood too, just pre warm the plastic before putting it in the vice. Hope this is useful to someone.;)
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Old 09-11-2007, 09:04 AM   #2 (permalink)
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Dang, Skip, you come up with some nifty ideas!!
William "Cav" Cavanaugh
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Old 09-11-2007, 10:16 AM   #3 (permalink)
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Pretty clever, Skippy!!!!!

I recognize that PR (it's from the Princess!!)
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Old 09-11-2007, 10:45 AM   #4 (permalink)
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Aaaahhh, ya beat me to it. Had an idea like that, just haven't got there yet. Looks great!
Paul in OKC, OK

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Do not conform to the pattern of this world, but be transformed by the renewing of your mind..........
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Old 09-11-2007, 11:23 AM   #5 (permalink)
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Thanks for sharing that, Steven. I had been looking at your pens and your comment about two hole-saws but I knew they didn't match and couldn't figure out that solution. Now I know!!! Thanks!!

Get used to it, That has happened to me about 3 times so far. [:D] The truly sad thing is that each time their version is way above what I was even envisioning. [:(] (for me) [:D][:D][:D] (for them!)

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Old 09-11-2007, 02:10 PM   #6 (permalink)
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Have you thought of trying to modify the hole saws to reduce the set on the teeth. Pull in the outer teeth of the larger saw and pull out the inner teeth of the smaller one. Not even sure if you can do this but it seems you have a lot of experience with metal.

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Old 09-11-2007, 05:45 PM   #7 (permalink)
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Simple, handy solution (I LIKE simple) requiring very little extra expense. GREAT!!
Bill "Tip" Tippery
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Old 09-11-2007, 10:12 PM   #8 (permalink)
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Wow! That's what I call creativity. The practical kind too, like Tip said. That's the kind of thing that keeps me turning. When something starts to get kind of boring, look for a new idea. You must be one of those people who's always experimenting. Keep up the good work!
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Old 09-12-2007, 12:41 AM   #9 (permalink)
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Very good idea Steve, love the colour combination! [:p]
Mark Ligget

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Old 09-12-2007, 03:39 PM   #10 (permalink)
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Thanks for the tip,that`s using your head for something other than a hat rack.

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