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Author Topic: Saddle Experiments - Best material???  (Read 50525 times)

Offline spt

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Saddle Experiments - Best material???
« Reply #30 on: January 20, 2007, 12:56:47 PM »
David, when you're done and have a minute, please tell me what specialty resins you use and if the finished product is easy to work with (sand, file)... TIA
 

Offline dlovegrove

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Saddle Experiments - Best material???
« Reply #31 on: January 20, 2007, 01:10:00 PM »
Dreadman, my measurements are similar to yours - except for the saddle slot on my 18SW, which is .120. Do you have a suggestion for the saddle height? I assume I should aim slightly high, so people can adjust action as necessary. This one is measuring .3265 from the base to the top of the crown at its highest point, but it has been sanded.

SPT, my first casting here will be with Smooth-On's Task-9 as the base; I've got some Polytek 15-3 on the way. A guy at Smooth-On told me they have a couple other formulas that match our needs better, but the complexity and precision of mixture is quite high; he suggested I start with the Task-9, and move to those if it looks like I'm going in the right direction.
David




Offline Dreadman

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« Reply #32 on: January 20, 2007, 02:34:48 PM »
David - I've seen everywhere from .325 - .350 in height and I've always sanded even the lower ones to acheive good action. I'd think around .325 would be a good starting point.

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Offline dlovegrove

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Saddle Experiments - Best material???
« Reply #33 on: January 22, 2007, 05:53:07 AM »
Just an update, for anyone who was following this...

I made a new master out of micarta, because it has a very slight surface texture that's not unlike bone. Given my brother's thoughts about surface imperfections, I thought that might be a good thing. I'm fairly pleased with it; it measures out identically to my plastic one, except that I kept the sides straight. Okay, measuring out isn't necessarily good... most of these resins have a shrinkage rate around .005 per 1. But the various additives should cut that in half, and at this size the shrinkage won't be measurable.

Since then, I've just been casting molds of it. Might as well make multiples of each test, if I'm going to the trouble!



There it is, in my favorite tiny-item mold box - the Altoids tin.
David




Offline spt

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« Reply #34 on: January 22, 2007, 07:07:14 AM »
Looks good! (Next: sounds good?)
Thanks for the update.
 

Offline newlywashed

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« Reply #35 on: January 22, 2007, 08:21:36 AM »
HEY! - great work there dlovegrove! - I'm looking forward to find out your thoughts on sound quality improvements.  - on a side note...HOW do you post pictures on here? I just got my new guitar and would love to share...
 

Offline vheissu

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« Reply #36 on: January 22, 2007, 08:34:44 AM »
That's some good work you did there David. How long did it take you to make?

Ben

Offline spt

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« Reply #37 on: January 22, 2007, 09:15:25 AM »
quote:
Originally posted by newlywashed

  - on a side note...HOW do you post pictures on here? I just got my new guitar and would love to share...


On Pike's suggestion, quite a few of us use photobucket.com, but there are others.
On Photobucket, you create a free account and upload your pictures. Photobucket gives you a web link that you just have to copy, then paste into your post on the forum.
If you have trouble, just get back to us and someone will surely pick it up.
 

Offline newlywashed

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« Reply #38 on: January 22, 2007, 09:53:33 AM »
 

Offline newlywashed

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« Reply #39 on: January 22, 2007, 09:55:20 AM »

sorry to use up space with this test again...
 

Offline Dreadman

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« Reply #40 on: January 22, 2007, 11:31:13 AM »
Wow. Looks good David. The details are nice and crisp. Did you mold that one or cut it?

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Offline dlovegrove

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« Reply #41 on: January 22, 2007, 12:32:21 PM »
I cut that one; Dremel to general size and then files/sandpaper to finish. I'm a little fanatical about precision. Took me a couple hours Saturday afternoon. I've got three molds made from it now, so I hope to cast tonight.

You can't tell in that photo but it's much taller than a typical saddle, because I'll fill the mold from that bottom edge. Then I'll grind it down to size, eliminating any unevenness resulting from the cast.
David




Offline newlywashed

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« Reply #42 on: January 22, 2007, 01:25:16 PM »
Thanks for being fanatical - it shows! I'm sure all of this work will pay off for you. How much cure time for these?
 

Offline dlovegrove

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« Reply #43 on: January 22, 2007, 02:30:56 PM »
The silicone molds take 6 hours to cure, then 4 hours to post-cure in an oven. The resin I'll be pouring tonight only takes 30 minutes for the initial cure, then 2 hours post-cure.
David




Offline dlovegrove

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« Reply #44 on: January 23, 2007, 09:24:30 AM »
Here are the first out of the mold:

The ivory-colored one is the micarta master; the clear ones are just pure resin, as I was testing the material; the black one has stuff mixed in. I haven't tried any of the most promising additives yet; I was just trying to get used to the stuff. None of these have been sanded down to height. I'll cast more tonight.

David