Hi Benjamin:
You were the one to start this whole idea.
The plexiglass would likely hinder it a little, but if the action were mounted on a jig, you could lift one hammer at a time if you lay it face up. The plastic is probably a little bigger than it needs to be, and you could use something thinner like a piece of sheet metal, as long as it's stiff enough. That would allow you to use the tool with other hammers in place, though I don't know how you would be sure of keeping the tool square to the sides of the hammer. I used plastic because I thought it would be nice to be able to see through, but really it doesn't matter.
I found that pinching the hammer against the plastic is the best way to insure that the sanding is done square. You have to allow some slack to allow the surfaces to slide a bit, to control of the pressure on the belt lest you remove too much material near the crown. I"m trying to imagine some kind of foolproof method to avoid this. If you begin sanding on the shoulders and rotate the sander towards the crown, radius of the hammer becomes smaller. The larger radius of the shoulder felt is easier to sand and maintain control. As you rotate the sander, you have to slide the rotation point towards the tip of the hammer because the diameter (radius) of the hammer is smaller. You don't want round hammers, but somewhat egg shaped. I"m thinking of some kind of cam mechanism that would push the center of rotation towards the hammer tip as you rotate the sander. That way you wouldn't have to loosen your grip on the hammer as you rotate the tool.
I've seen the air powered sanders, which look promising, but the air supply needed requires a big compressor with at leas 4 cfm to run it, and you still have a hose to contend with. And all the noise. Then there's the speed aspect. I had this running on the slowest speed, and even then you can take quite a bit of felt off in a hurry. I don't know how much you could control an air tool. There are also battery powered sanders, but then there's the added weight. The power cord on this is very thin, which makes it all the more manageable when you're manipulating the tool. And it's low voltage.
I suppose you could clamp this thing to your bench and remove the hammers and sand them. I used to use a spindle sander, which worked well, but to get under the cove of a grand hammer requires a small diameter sanding cylinder, which makes it much easier to gouge the felt. I like the thin tip of this, and it could work with hammers removed. I wouldn't dream of using this without some sort of squaring surface.
Paul McCloud
San Diego
Benjamin Sanchez
Cool, thanks for sharing! That looks like it's exactly what I'm looking for.
Quick question. It looks from the pictures that it works well on grand hammers. Do you think it would work on upright hammers as well, or would the plexiglass hinder it?
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Benjamin Sanchez, RPT
Piano Technician / Artisan
(805) 315-8050
www.professional-piano-services.com
Original Message:
Sent: 10/19/2020 2:21:00 PM
From: Benjamin Sanchez
Subject: RE: New Hammer Sanding Tool
Cool, thanks for sharing! That looks like it's exactly what I'm looking for.
Quick question. It looks from the pictures that it works well on grand hammers. Do you think it would work on upright hammers as well, or would the plexiglass hinder it?
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Benjamin Sanchez, RPT
Piano Technician / Artisan
(805) 315-8050
www.professional-piano-services.com
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Original Message:
Sent: 10-19-2020 11:46
From: Paul McCloud
Subject: New Hammer Sanding Tool
Here's from Alibaba (And the Forty Thieves):
https://www.alibaba.com/product-detail/Electric-Belt-Sander-Mini-Belt-SMini_1600075000790.html?spm=a2700.galleryofferlist.normal_offer.d_title.2a5938afxaKSlr
Basically, this was a kind of "Proof of Concept", to see if a self-contained hand-held sander like this could be adapted. There are of course many other offerings from various companies which are 5 times as expensive and perhaps more powerful, with folding handles, cool-looking, etc. From the Alibaba site, there are many other mini belt sanders very similar to ones with familiar brand names over here, and half the price. I didn't even look at Harbour Freight, they may have one too.
YMMV.
Paul
I went on the Canadian site, and here's the same thing for $71 CDN:
www.amazon.ca/...
The price difference might be how far from the distribution center you are.
I've seen these in a variety of brand names. It wouldn't surprise me to find out that they wholesale for $10 if you buy a bunch of them.
Paul McCloud
Original Message:
Sent: 10/19/2020 11:34:00 AM
From: Paul McCloud
Subject: RE: New Hammer Sanding Tool
I went on the Canadian site, and here's the same thing for $71 CDN:
https://www.amazon.ca/Electric-Grinder-Grinding-Machine-Hand-held/dp/B08354RBY8/ref=sr_1_161?dchild=1&keywords=mini+belt+sander&qid=1603121356&sr=8-161
The price difference might be how far from the distribution center you are.
I've seen these in a variety of brand names. It wouldn't surprise me to find out that they wholesale for $10 if you buy a bunch of them.
Paul McCloud
John Musselwhite
Interesting tool. While the Amazon site says $26.99 no import fees and $10.39 shipping to Canada, dropping the .com and replacing it with .ca to get to the Canadian Amazon site, we see that exact same tool is selling for $131.88 CDN! Unbelievable!
John
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John Musselwhite, RPT
Calgary, AB Canada
www.musselwhite.com
Original Message:
Sent: 10/19/2020 11:16:00 AM
From: John Musselwhite
Subject: RE: New Hammer Sanding Tool
Interesting tool. While the Amazon site says $26.99 no import fees and $10.39 shipping to Canada, dropping the .com and replacing it with .ca to get to the Canadian Amazon site, we see that exact same tool is selling for $131.88 CDN! Unbelievable!
John
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John Musselwhite, RPT
Calgary, AB Canada
www.musselwhite.com
Original Message:
Sent: 10-18-2020 20:06
From: Paul McCloud
Subject: New Hammer Sanding Tool
A recent discussion regarding using a powered mini sanding belt tool prompted me to look on Amazon and see if such a tool could be adapted to sand hammers.
Here's a link to the one I found: https://www.amazon.com/gp/product/B089LNM726/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
It works very well with just the addition of a small piece of clear plexiglass. It cost me all of about $30. It runs off of a small power supply, included, which varies the speed of the tool. It converts 110v to 4/5 to 24 volts. Belts are included, along with a couple allen wrenches. The belt mechanism is self tensioning, and tracks well. The motor has an on-off switch, and a reversing switch so you can run the sander in either direction. It weighs about 2 pounds, and doesn't have any frills or rubber handles like one would expect on an expensive tool. I took some photos of it, and a couple videos showing how it works. I tested it out this afternoon, and it works quite well with the included fine sanding belt. It's just a little shy of the full width of a hammer, but a little hand sanding can take care of that. You'll of course finish off with some finer sandpaper anyway.
Not to diminish the other tool sold by Dale Erwin, which I also own, but it's a lot more convenient and cheaper than buying the expensive tool, and also a Foredom tool (more $$$), and deal with a cumbersome flex shaft and speed pedal.
I took some photos and a video (2 parts) which I"m attaching here. Hope this helps somebody.
Paul McCloud
San Diego
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Paul McCloud, RPT
Accutone Piano Service
www.AccutonePianoService.com
service@accutonepianoservice.com
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