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Does anyone use a flat sanding bar ?
http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10123&t=45750
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Author:  AR15DCM [ Wed May 20, 2015 4:33 pm ]
Post subject:  Does anyone use a flat sanding bar ?

Does anyone use a flat sanding bar as a start to prep a body or fingerboard?

Author:  Tim Mullin [ Wed May 20, 2015 6:39 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

As in a "sandpaper plane" -- length of stabilized 19mm particle board (scrap from a sub-floor panel) with P80 stuck to one side and P120 on the other? Yep, use it for all kinds of things. Needs to be straight, and with both sides covered to stay straight.


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Author:  dzsmith [ Wed May 20, 2015 7:47 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

Yep,
I can grab the two handles and use it like a plane, or flip it over and clamp it into my workmate.
For precise leveling, i use an aluminum angle extrusion about 18" long that I have checked with a precision straightedge.
The 3m stikit tape works great with these.
Dan

Author:  AR15DCM [ Wed May 20, 2015 11:31 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

I have seen these square tubes that are ground mechanically flat on two sides being sold for $40-$50 etc... and I ran across these 11" Sanding Bars from Great Planes for $13.90 incl. shipping.
They weren't perfectly flat, but I took some wet/dry sand paper and a few minuets on my inspection plate and it became .00005" flat in no time at all.

There is a 5.5" version as well for $7.98 incl.shipping. I bought one of these too and did the same thing to it.

Also I wanted to ask, what is the easiest way to make a neck rest caul like Stewart MacDonald sells? Use a router bit down the middle of a board? Or is it done another way?

Author:  Glenn_Aycock [ Thu May 21, 2015 7:12 am ]
Post subject:  Does anyone use a flat sanding bar ?

AR15DCM wrote:
Also I wanted to ask, what is the easiest way to make a neck rest caul like Stewart MacDonald sells? Use a router bit down the middle of a board? Or is it done another way?


Assuming you mean this: Image

The problem with the router is you need a large radius bit (more dangerous) or some kind of swing jig for the radius.

A very simple way to do it with a table saw is to cut a shallow V channel through a length of wood and glue a strip of leather or hard felt pad across the channel, which will smooth it into a curve.

Angle blade and the set fence on side of blade so it's angled toward the fence (depending on R/L tilt). Run it through one way, flip it around and do it again.

If you want an angle > 90, you'll probably have to run the block through vertically instead of horizontally.

You could also use a cove-cutting technique by running the board across the table saw blade at angle (instead of parallel or perpendicular). The idea is that the blade doesn't cut all the way through but instead leaves a smooth, round-bottom channel. Like this:

Image

I'll try to demonstrate both methods tonight.

Glenn

Author:  AR15DCM [ Thu May 21, 2015 11:28 am ]
Post subject:  Re: Does anyone use a flat sanding bar ?

Yes I have seen that method on the net... That is why I said I don't have a table saw... I wish I did :-)

However, I do have a mill and can throw a 1/2" shank router bit into the tool holder. I don't think that would be a problem at all. I just didn't know if there were other ways of doing it because if I do it on my mill I will need to clean it up to make sure I don't get any oil on the wood etc... etc...

Author:  Glenn_Aycock [ Thu May 21, 2015 6:05 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

AR15DCM wrote:
Yes I have seen that method on the net... That is why I said I don't have a table saw... I wish I did :-)

However, I do have a mill and can throw a 1/2" shank router bit into the tool holder. I don't think that would be a problem at all. I just didn't know if there were other ways of doing it because if I do it on my mill I will need to clean it up to make sure I don't get any oil on the wood etc... etc...

Sorry, must have missed your remark about the lack of table saw. I could drop one of these cauls in the mail for you (US only). I've been meaning to make one for myself anyway.

Glenn

Author:  AR15DCM [ Thu May 21, 2015 9:19 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

That would be fantastic ! Do you have PayPal ? I can shoot you the postage and whatever costs you want.
I have a 24" x 60" x 1/16" roll of cork that I bought for $2.00 at the local thrift shop.

Thank you.

Author:  Glenn_Aycock [ Fri May 22, 2015 6:50 am ]
Post subject:  Does anyone use a flat sanding bar ?

I won't get a chance to make it until the weekend. How long do you want it? Also, I'm planning to use pine or fir. Do you think it will be hard enough? Otherwise I'll use hardwood.

Author:  AR15DCM [ Fri May 22, 2015 10:32 am ]
Post subject:  Re: Does anyone use a flat sanding bar ?

12" would be great. It is just a neck rest so just about any wood should work. Unless you know something I don't.

Author:  Glenn_Aycock [ Sat May 23, 2015 4:44 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

AR15DCM wrote:
12" would be great. It is just a neck rest so just about any wood should work. Unless you know something I don't.

Will this work for you?
Image
Image


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Author:  Glenn_Aycock [ Sat May 23, 2015 7:41 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

Here is my soon-to-be radius sanding block routing jig.
Image

I want to make my own long sanding blocks.


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Author:  AR15DCM [ Wed May 27, 2015 9:35 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

Glenn_Aycock wrote:
AR15DCM wrote:
12" would be great. It is just a neck rest so just about any wood should work. Unless you know something I don't.

Will this work for you?


Sure that will be fine!

Author:  Glenn_Aycock [ Wed May 27, 2015 9:57 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

AR15DCM wrote:
Sure that will be fine!


Where to? Send PM if you don't want your address public.

I've got the radius block routing jig working pretty well, but it's not designed for very small radii like this.

Author:  AR15DCM [ Mon Jun 01, 2015 9:07 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

I bought a nice barely used 3/4 HP Grizzly Shaper on Craigslist day before yesterday for $275. So I ordered this bit on Amazon to make guitar neck rest cauls....

If I cut the board 2-3/4 wide that will leave a 1/4" ledge on either side of the cut.

Attachment:
Magnate.jpg

Author:  Glenn_Aycock [ Mon Jun 01, 2015 9:28 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

Cool! I didn't get a chance to mail that caul yet (sorry). Looks like you won't need it now. You're like me - spend $300 to make a $15 item. :-)

Author:  fumblefinger [ Sun Jun 14, 2015 7:13 pm ]
Post subject:  Re: Does anyone use a flat sanding bar ?

I made mine by running it across the top of my belt sander. Clamped a backstop to the frame at the top.

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