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PostPosted: Wed Mar 13, 2019 2:42 am 
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Joined: Fri Jul 10, 2009 4:44 am
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First name: colin
Last Name: north
Country: Scotland.
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Just a simple one.
I once asked how deep scratches from abrasives were for different grits, to estimate how much thickness I has to remove to eliminate those from previous grits.
No simple definitive information was forthcoming, so to give me an indication, I now rub chalk (smudging it in with my finger) into the sanding scratches/grooves made by the abrasive on the drum sander so I can see when the current abrasive has removed all the scratches from the previous coarser grit of abrasive.
I can then progress up though the grits efficiently.
Otherwise I feel I can either sand excessively on each grit, thus loading up my finer grits and wasting abrasive, or can risk ending up with scratches from the coarser grits which will show up when finishing.


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PostPosted: Fri Mar 15, 2019 6:38 pm 
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First name: Don
Last Name: Parker
City: Charleston
State: West Virginia
Zip/Postal Code: 25314
Country: USA
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Great idea, Colin! Out of curiosity, how fine do you go on your drum sander?


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PostPosted: Fri Mar 15, 2019 7:55 pm 
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I like that idea but the only ever have 60 or 80 (depending on what rolls are available when I buy them) on my sander. I only use it to thickness then scrape and or sand to final finish later. But this would still be helpful for those steps. Do you ever have problems with chalk showing up in open pores?

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PostPosted: Tue Mar 19, 2019 4:39 am 
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First name: colin
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P120 Don.
No problem with pores so far Brian. Abrasive particle show up as long scratches.

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PostPosted: Tue Mar 19, 2019 6:15 am 
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First name: Don
Last Name: Parker
City: Charleston
State: West Virginia
Zip/Postal Code: 25314
Country: USA
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Status: Amateur
Cool; that fits with the plan I have worked out in my head (haven’t had a chance to fully implement yet on guitar woods) for getting rid of drum sanding scratches, which do seem to be stubbornly deep. I was going to go most of the way with 80 grit on the drum, then switch to 120 on the drum for hitting the thickness I want. Then, after construction of the guitar, start the finish sanding process at 80 grit on a random orbital sander, just enough to completely get rid of any 120 sanding scratches. Then progress up the grits either with the ROS or by hand. I’ve had an issue with 80 grit drum sanding scratches, and I need a good solution. I will definitely use the chalk idea. Thanks!


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