|Forum topic by Wildwood||posted 07-03-2016 07:03 PM||406 views||0 times favorited||4 replies|
07-03-2016 07:03 PM
Goal for every woodturner to aim for is off the tool finish! Most professional & non-professional woodworkers hate sanding! Only reasons to sand is remove imperfections and prepare surface for finish. In reality many of us woodturner sand to excess! We spend more time sanding than necessary! Once imperfections like tool marks, ridges, etc gone why sand any further? Over sanding just burnishes the wood and possibility of finish not adhering to the surface.
General rules to live by. You cannot sand away torn end grain! Those scratches at the bottom of a bowl impossible to sand away. Re-sharpen your gouge or scraper, improve your turning technique! Depending upon shape of the bowl need different bevel angle or gouge with double bevel.
My personal preferences is choose a sanding sequence based upon surface of the wood before me! Select the highest grit to get started if 100 grit or 150 grit will work don’t start with 80 grit. Yes, have been times wished had 60 grit on hand! Have spent days removing sanding scratches after using 80 grit! Sand thru higher grits until cannot see sanding scratches from previous sanding and then stop sanding! Be sure remove sanding dust as move thru each grit.
Every finishing manufacturer provides a sanding sequence for the products they sell won’t hurt to follow their advice! Most finishing wood books echo what the manufacturers say! Yes, your mileage will vary!
Buy good sandpapers! I start with aluminum oxide (friable) and finish sand with garnet paper (non-friable). Also use blue flex disc from Vince’s for power sanding.
At one time used higher grit stearated AO paper, Silicon Carbide wet/dry paper for finishing the finish. This where need higher grit papers! These days prefer to use micromesh wet sanding/polishing for that purpose! Some folks prefer rubbing compounds & buffing wheels.
Things have learned about sanding:
Use a light touch, turn my lathe down to lower speed to avoid burnish the wood.
Sandpapers can be a blessing or curse. You can add to imperfections or mask design details by improperly sanding or too much sanding.
All sandpapers get dull with use, throw dull sandpaper away the grit does not become suddenly finer! Pressing too hard will dull sandpaper faster and burnish the wood! If you are riding the bevel turning also burnish the wood but light sanding prepares surface for finish.
After think am done with sanding bare wood wipe off with MS or plain water and check for scratches didn’t see; take outside and check in sunlight before apply finish!
Everything want or not want to know about sand paper!