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Tips on grinding pads- B&R Jig and Disc Sander

Discussion in 'Shooting Related Threads' started by skeet_man, Dec 16, 2008.

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  1. skeet_man

    skeet_man Well-Known Member

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    Jan 29, 1998
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    Rochester, NY
    Got my B&R jig a week or so ago (after being backordered from brownells for a month and a half). Finally got it setup about a half hour ago on a 10" harbor freight disc sander (really not half bad for $50 or $60). Messed around grinding one pad for a rifle, its close, not professional, but i'm tired (was fixing to go to bed, but i've been putting off setting this thing up for a week and finally had the ambition to get'er done) and the lighting was very poor. The finish on the pad was alot better than I expected right off the disc (I think i have a 60 grit disc on there now). One thing I did notice is if you try to grind on the wrong part of the disc, it gets VERY grabby, you really have to find a sweetspot on the disc and not wander too much. I may change to a belt sander eventually, but the disc was cheap, and I didn't want to invest too much incase this venture was a flop. Any tricks you can share about my setup (you know, those things I'll eventually figure out by experience, but they'd be nice to know now).
     
  2. Pull & Mark

    Pull & Mark Well-Known Member

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    I too say a belt sander (Alumiun Oxide belts). Will work for the metal adj. butt plates if you ever have need to install one of those as well. Have fun. Break-em all. Jeff
     
  3. omahasportingsupply

    omahasportingsupply TS Member

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    Good advice. Thanks
     
  4. phirel

    phirel TS Member

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    Disk sanders will work but you must realize that different areas of the disk are spinning at different rates. I used a edging sander (6' belt sander mounted on a heavy base with a table that can be adjusted for angle). I used a 150 grit belt just because that was the belt always on the machine for other work I was doing. Whatever sander you use will make a great mess in the shop and on your face.

    I tried putting the pads in a freezer overnight and could not tell any difference when sanding them. With a little practice with scrap wood, you can learn to sand exactly to a line. Touching up the plastic with 220, 280 and 320 grit paper and then a little polish will make the plastic shine.

    Pat Ireland
     
  5. DENNISMASTROLIA1

    DENNISMASTROLIA1 Active Member

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    Pat--I don't understand the speed issue that you mentioned.A revolution is a revolution-a solid disc cannot spin at a different speed at any section of it.Or can it??LOL--Dennis--Thanks
     
  6. Ahab

    Ahab Well-Known Member

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    Dennis.........the rpm will be the same, but, the surface speed will be different

    Lets say it is spinning at 600 rpm = 10 rps.At 2 inches from the center the surface speed will be 2 x 3.14159 = 6.28318 inches per second.

    At 5 inches from the center surface speed = 5 x 3.14159 = 15.70795 inches per second.. that is 2.5 times as fast.
     
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