I have a 4 1/2 inch grinderette 10000rpm. Tried 36 grit fibre backed disks in both Aluminium oxide and zirconium oxide. Neither lasts. I can get silicon Carbide in grits 24 and 36 but I havent tried them yet.
I also have a slower variable speed sander polisher 900-3000 rpm with 6" backing pad but only have abranet disks down to 80 grit. Far too slow.
What are the fin makers amongst you using for dry sanding G10?
Mark
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I have a 4 1/2 inch grinderette 10000rpm. Tried 36 grit fibre backed disks in both Aluminium oxide and zirconium oxide. Neither lasts. I can get silicon Carbide in grits 24 and 36 but I havent tried them yet.
I also have a slower variable speed sander polisher 900-3000 rpm with 6" backing pad but only have abranet disks down to 80 grit. Far too slow.
What are the fin makers amongst you using for dry sanding G10?
Mark
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Mark, 36 grit at the highest rpms my friend. Have fun! Hate the smell of G-10. Mahalo, Larry
Larry I am finding that after about 15 passes with the 36 grit Al oxide and also Zirconium disk ( 4 1/2" @ 10000 rpm) the edge has gone of the abrasive and the G10 is getting a little brown from overheating. Maybe not quality disks or maybe I am staying in the same area too long although it is 8mm sheet so quite a bit of material has to come off. I am going to try 6" • Premium Zirconia & Aluminium Oxide grain mix disks @ 3000rpm and 4 1/2 silicon carbide @ 10000
Mark
…hello,
your problem is on the type of sanding disc not the grit, etc
you should use an angular sander not those mini grinders
why? because of those discs
no one of those backed disc etc perform right
so with an angular sander/polisher with the rigid pad that comes in it and with a “normal” 36 grit to use on that, is the way to go
then you can use another type of pad and lesser grits to smooth things out
OK thanks, yes the small grinder and the fibre backed sanding disks don’t have a flat surface. (The disk goes wavey when the centre is tightened.)
I looked up on the SIAT abrasive site and they recommend for paint, glass, stone, solid surface composites,glassfibre their 4700 which is silicon carbide. So I am getting a range of grits of silicon carbide hook and loop (velcro disks)for my sander/polisher with 6" pad.
Mark
I don’t foil fins but if you lean your grinder too much in favour of the outer part of the pad the more heat that will be generated as that part of your sandpaper has more distance to cover in the same amount of time.
Not sure if you have seen the bottom of a Power Pad either, but if you run your pad on the “two circles” (you can feel them on a Power Pad) your pad will be much closer to being flat to the surface. So thinking of it this way might help with your heat problem if you are leaning your pad too far in favour of the outside of it. Smaller pads generate less heat as well.
Hey Mark
I use the angle grinder/ hard rubber pad/ 36 grit disc with a speed controller to drop the speed down a bit. It seems to reduce the amount of burn, adds a bit of control, makes the disc last longer, and removes the material at a similar pace.
Well worth the effort
CJ