General Category > General Discussion
Sanding problem
Katchin:
Hi, I am making a clock currently, and have sanded the main housing down to 600 grit, using the sorby sandmaster. However as you can see, I have a problem in two place on the rim, what is causing this? I have restarted on the rim once, going back to 120 grit and back down to 600, but the same thing happened, is this the wood? will it be hidden by sanding sealer? I was planning on using a sanding sealer / microcrystaline wax finish.
Katchin:
Adding the photo's may help ::)
Andy Coates:
The woods looks like sapelle, iroko,or other of the mahogony group, which are notoriously difficult to get a good finish on. Especially on a curved surface.
I suspect the trouble derives from the quality of the original cut, not a lack of sanding. You could try to re-cut the surface but you face the problem of having already sanded the surface. It's not a good idea (ever) to go back to cutting after sanding because the abrasive leaves tiny particles of the abrasive in the wood and this will blunt you tool very quickly.
Sanding sealer will not help, in fact it will darken the offending torn grain and make it look ten times worse. As will any finish applied. So your options are re-cut - with the problem of having to re-sharpen the tool a few times, or to continue abrading and hope you can get it out. Neither option is 100% certain.
The best option for the future would be to not use sapelle.
petjeffery:
hi there i think the same as andy has said but i was think may you could add a textre to it were that part is to try and cover it up a bit or a inlay of some sort sorry i cant help any more than that
er i was just thinking that may be you could use a drill with the sanding pad in it and do not turn the lathe on and just work the part were that is and till it goes but do not press to hard or you well end up with a flat point
well hope this helps a bit
GwilymF:
I use Sapele and Iroco a lot and when I get this problem I use standard cabinet scrapers to good effect. As Andy stated this is quite prevelent on Sapele and Iroco.
Gwilym
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