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New Hammer Sanding Tool

  • 1.  New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-18-2020 20:07

    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



    ------------------------------
    Paul McCloud, RPT
    Accutone Piano Service
    www.AccutonePianoService.com
    service@accutonepianoservice.com
    ------------------------------


  • 2.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-19-2020 11:16
    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

    ------------------------------
    John Musselwhite, RPT
    Calgary, AB Canada
    www.musselwhite.com
    ------------------------------



  • 3.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-19-2020 11:34
    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

    ------------------------------
    John Musselwhite, RPT
    Calgary, AB Canada
    www.musselwhite.com





  • 4.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-19-2020 11:47
    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




  • 5.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-19-2020 14:21

    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?



    ------------------------------
    Benjamin Sanchez, RPT
    Piano Technician / Artisan
    (805) 315-8050
    www.professional-piano-services.com
    ------------------------------



  • 6.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-20-2020 14:00
    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?

    ------------------------------
    Benjamin Sanchez, RPT
    Piano Technician / Artisan
    (805) 315-8050
    www.professional-piano-services.com





  • 7.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-20-2020 11:50
    This looks great!

    I was able to find a similar device that runs on air. The total weight in your had is probably less and if you already have a compressor the total cost is a little less.

    ------------------------------
    Aaron Heppler
    Manhattan MT
    406-209-2063
    ------------------------------



  • 8.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 02-27-2021 08:04
    Aaron,

    Can you give details on the unit you found?  I'm interested in checking that out. Thus far the only o rd I've seen have a pretty long arm on them, not a deal breaker, but I'd like to see yours. 

    Thx

    Pwg

    ------------------------------
    Peter Grey
    Stratham NH
    603-686-2395
    pianodoctor57@gmail.com
    ------------------------------



  • 9.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-20-2020 17:43
    Hi Paul,

    Thanks for letting us know about this.  I watched the video you posted.  It looks like the belt is too narrow for the full width of a hammer.  Is that true or did it just appear that way in the photo.

    Thanks

    ------------------------------
    David Weiss
    Charlottesville VA
    434-823-9733
    davidweisspiano@gmail.com
    ------------------------------



  • 10.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-20-2020 19:55
    Hi David:
    Yes, the belt is just a bit shy of the hammer width. I haven't measured the length, so i'm not sure whether the standard size belts available will fit. If standard sizes will fit, likely there's a belt just slightly wider. The hammer is about 1/16" wider than the belt. It is very easy with a little manual cleanup to sand one side to match the rest of the hammer. Next time I'm over at the shop I'll measure the belts and see what's up.
    Paul


    David Weiss

    Hi Paul,

    Thanks for letting us know about this. I watched the video you posted. It looks like the belt is too narrow for the full width of a hammer. Is that true or did it just appear that way in the photo.

    Thanks

    ------------------------------
    David Weiss
    Charlottesville VA
    434-823-9733
    davidweisspiano@gmail.com





  • 11.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 10-20-2020 20:25
    Here's the stated belt size:
    Abrasive Belt Size: 330 * 10mm. (Roughly 13" by a little more than 3/8").

    Paul




    David Weiss

    Hi Paul,

    Thanks for letting us know about this. I watched the video you posted. It looks like the belt is too narrow for the full width of a hammer. Is that true or did it just appear that way in the photo.

    Thanks

    ------------------------------
    David Weiss
    Charlottesville VA
    434-823-9733
    davidweisspiano@gmail.com





  • 12.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 11-12-2020 12:03
    Well, I just finished my first set of hammers using this tool, and I love it! It's very easy to control, especially on the lowest setting with the highest grit. My first time with the mini belt sander was about 60% of my regular time, and half of that was figuring out how to use it. The results were really nice, and I expect my time to drop the more I do it. A big thank you to Paul McCloud for finding this!

    ------------------------------
    Benjamin Sanchez, RPT
    Piano Technician / Artisan
    (805) 315-8050
    www.professional-piano-services.com
    ------------------------------



  • 13.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 11-12-2020 12:09
    Hi Ben:
    It was your idea after all. Glad it works well for you. Big time saver for sure. You can use it in the home too.
    Paul


    Benjamin Sanchez
    Well, I just finished my first set of hammers using this tool, and I love it! It's very easy to control, especially on the lowest setting with the highest grit. My first time with the mini belt sander was about 60% of my regular time, and half of that was figuring out how to use it. The results were really nice, and I expect my time to drop the more I do it. A big thank you to Paul McCloud for finding this!

    ------------------------------
    Benjamin Sanchez, RPT
    Piano Technician / Artisan
    (805) 315-8050
    www.professional-piano-services.com





  • 14.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 02-26-2021 09:16
    Looking for update. For those who have bought and used this thing (currently unavailable on amazon) how has it performed for you?

    I was thinking about getting one, though some reviews are not so good. 

    Thx

    Pwg

    ------------------------------
    Peter Grey
    Stratham NH
    603-686-2395
    pianodoctor57@gmail.com
    ------------------------------



  • 15.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 02-26-2021 15:35
    https://www.ebay.com/itm/Miniature-Belt-Sander-Multifunctional-Handheld-Electric-Belt-Sander-Grinding/143939846225?hash=item21837bc051:g:RIEAAOSwZylgHjFH

    This is the same sander that I have, sold on Ebay. Same price as the one I got. It's not mentioned on this ad, but there is a power supply included that allows reverse and speed control.
    Paul McCloud
    San Diego



    Peter Grey
    Looking for update. For those who have bought and used this thing (currently unavailable on amazon) how has it performed for you?

    I was thinking about getting one, though some reviews are not so good.

    Thx

    Pwg

    ------------------------------
    Peter Grey
    Stratham NH
    603-686-2395
    pianodoctor57@gmail.com





  • 16.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 02-27-2021 07:00

    I have Dale Erwin's mini belt sander. It is powered by a fordam tool.  I love it!






  • 17.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 02-27-2021 11:23
    Nice idea, Paul. The original link shows not available but this link appears to be the same thing (as best as I can tell from reading the description.)

    https://smile.amazon.com/Meterk-Multifunctional-Handheld-Electric-Polishing/dp/B08HYMD1X3/ref=sr_1_41?dchild=1&keywords=mini+belt+sander&qid=1614442668&sr=8-41

    The angle of the mounting of the motor makes this one appear better balanced for what we do.

    I'll probably wind up getting an air model for the shop since I have it plumubed for air.

    Thanks!

    AG

    ------------------------------
    Allan Gilreath, RPT
    Registered Piano Technician & President
    Allan Gilreath & Associates, Inc
    Calhoun, GA
    706-602-7667
    allan@allangilreath.com - www.allangilreath.com
    ------------------------------



  • 18.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 02-27-2021 11:45
    Hi Allan:

    Yes, that's the one. El Cheapo for what you get.

    The use of air poses the problem of the air hose itself. I have the Foredom tool from Dale Irwin, which works well, but the cable is a bit cumbersome. If you get the air tool, let us know how it works for you in that regard.

    I don't know if you saw my photos and video I posted some time back. I mounted some plexiglas on either side of the sanding paddle to help square the sander to the hammers. It's very easy to use. The sanding belt is just
    a tad bit narrower than I would wish, but it works. Some touchup hand sanding, minimal, is needed, and probably you would do it anyway.

    I haven't used it yet in the field, but plan to in the near future. Rather than having to transport the action to the shop, etc., in-home sanding looks promising, without having to drag along a Foredom.

    Best,
    Paul



    Allan Gilreath:

    Nice idea, Paul. The original link shows not available but this link appears to be the same thing (as best as I can tell from reading the description.)

    smile.amazon.com/...

    The angle of the mounting of the motor makes this one appear better balanced for what we do.

    I'll probably wind up getting an air model for the shop since I have it plumubed for air.

    Thanks!

    AG

    ------------------------------
    Allan Gilreath, RPT
    Registered Piano Technician & President
    Allan Gilreath & Associates, Inc
    Calhoun, GA
    706-602-7667
    allan@allangilreath.com - www.allangilreath.com





  • 19.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 02-27-2021 14:46
    Allen,

    Thanks for the link. I just ordered it.

    Pwg

    ------------------------------
    Peter Grey
    Stratham NH
    603-686-2395
    pianodoctor57@gmail.com
    ------------------------------



  • 20.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 02-27-2021 13:46
    I've used mine four or five times now, and I really like it! The adjustable speed is very useful. The lowest speed is good for basic resurfacing, while the higher speeds are good for true reshaping. Additionally, I've used it to sand down leathers to the right size. I thought the length would be an issue but it wasn't after the first few minutes. For $30, you couldn't ask for a better mini belt sander.

    ------------------------------
    Benjamin Sanchez, RPT
    Piano Technician / Artisan
    (805) 315-8050
    www.professional-piano-services.com
    ------------------------------



  • 21.  RE: New Hammer Sanding Tool

    Registered Piano Technician
    Posted 03-01-2021 20:30
    Update:

    I got it. Handy little tool. I had to remove a massive amount of felt on a set of hammers. This tool helped dramatically. Took a little getting used to, but I like it.  Would be nice if the belt were wider...oh well. 

    Only thing it was missing was the set screws to hold the disk sander in place. Not a big deal though as I can probably find them at the hardware store. 

    Thanks for the tip, Paul. 

    Pwg

    ------------------------------
    Peter Grey
    Stratham NH
    603-686-2395
    pianodoctor57@gmail.com
    ------------------------------