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8" sander for large painted panels?7/15
We are testing the waters to see if anyone has tried using an 8" random orbit sander, air driven, such as the Dynabrade 58410 .
We have frequent numbers of large plywood and MDF panels that we sand, often 3ft by 8ft, which we spray two or three coats of white conversion varnish on.
We currently use 5" Dynabrade sanders and are quite happy with them, but wanted to see if anyone was using the 8" models and getting good results.
Especially, does the two-handed design of the 8" model (Dynabrade 58410) pose any issues?
We'd hate to spend $400-500 on a sander that everyone hates using.
Many thanks for your help--
you can switch out your 5" pad for a 6"pad.
Your going to find that bigger pads start cupping fairly quickly and start leaving undesirable results in your sanding.... 6" is good and just make sure your replacing your pads when they start to bow. Sanding is all about technique if you want those panels flatter.... multiple passes in all directions will yield better results and wont show as much sander tracking
Shane, you sound like you've had some experience with the 8" before, and I hadn't thought about the pad cupping. My main concern was that the only models I can find are two-handed versions, and everyone in our spray booth adore the Dynabrade 5" types because they are good one-handed.
I think what I'll do is get a 6" pad, try it out.
Anyone use a 3/8" (aggressive) orbit?
We like the standard 3/16" orbit, and for our stain we use the 3/32" orbits (which do fantastic for giving good, even, swirl-free stain).
I'm curious about whether the 3/8" orbit would give a good, faster cut on large panels (6") or if it would leave too nasty of a swirl pattern to hide with the second coat of paint.
I have a now discontinued 8"fien sander. It's a variable speed electric model and very powerful! There is no "one handed" operation. I can hardly use the high speed as it is too powerful to hold......I just turn the speed down. It is still very fast, but I might start with it. I never finish (as in preping wood to be finished) always switching to a 5 " or 6"random orbit for that ready to finish wood work. I have not used any other 8"Sanders. The pad is flat with no issues. It's size is great for leveling a large joint and much more forgiveing concerning diging in.
Thanks Jim, that's very helpful. I haven't seen the Fein yet, I imagine it's a good machine.
For big panels look at the 11" Gem sanders they use for solid surface countertops as well as the abrasives.
Have you thought about investing in a wide belt sanding machine
A wide belt would be overkill, and none of the ones I've ever used would be able to sand plywood that's primed and also compensate for the tiny irregularities in plywood surface. It would either burn right through some spots of the primer, or totally miss others.
Switching from 5" to 6" makes a big difference. We switched in 2000. The area is much larger. I think other than auto detailing on very curvy surfaces, the 6" discs are the ideal size for most everything.
5" disc area (19.6)
8" is overkill and has very few other uses.