Bruce Thompson
04-16-2022, 5:12 PM
Jet 1020 drum sander, 6 months old; claims it can handle stock as short as 2 3/4"
180 grit abrasive. .003 to .004" stock removal per pass. (1/16 rotation of drum height wheel where one rotation = 1/16")
Boxes 9 1/2" L x 4 3/4" W x 1 1/8" D
I'm making a travel chess set that is two small boxes to be hinged such that when opened, the chess pieces inside are removed and the two halves of the hinged box open up to a playing surface.
After gluing up the box-jointed sides, I put them through the drum sander to bring the proud edges of the sides down flush to the playing surface. Ran the boxes through, short side leading, about 10º off perpendicular to the drum, so 80º or 70º. Jet manual says not to run perpendicular; 60º angle is best. They looked good, so I thought I would turn them over and sand the open side edges smoother with a few light passes.
Afterwards i discovered that all of the corners are lower than the rest, by about .012" tapering to nothing about 3/4" in from the corners.
No one at Woodcraft, Rockler or Austin Hardwoods, nor the local Jet warranty repair guy, can tell me why that happened or how it is even possible.
477706 477707
Note the gaps between the saw table and corners at the bottom and between the straight edge and corners above. I can slide more than 4 sheets of note paper under the corner, and that mikes out to .0012+. When the hinged box halves are closed, the gap is double that, so about 3/64"
I can laboriously hand sand them to get them true, but that doesn't help me to understand the problem and to avoid it recurring.
(Tried to edit the title, but can't. Obviously I am using a sander, not a dander.)
180 grit abrasive. .003 to .004" stock removal per pass. (1/16 rotation of drum height wheel where one rotation = 1/16")
Boxes 9 1/2" L x 4 3/4" W x 1 1/8" D
I'm making a travel chess set that is two small boxes to be hinged such that when opened, the chess pieces inside are removed and the two halves of the hinged box open up to a playing surface.
After gluing up the box-jointed sides, I put them through the drum sander to bring the proud edges of the sides down flush to the playing surface. Ran the boxes through, short side leading, about 10º off perpendicular to the drum, so 80º or 70º. Jet manual says not to run perpendicular; 60º angle is best. They looked good, so I thought I would turn them over and sand the open side edges smoother with a few light passes.
Afterwards i discovered that all of the corners are lower than the rest, by about .012" tapering to nothing about 3/4" in from the corners.
No one at Woodcraft, Rockler or Austin Hardwoods, nor the local Jet warranty repair guy, can tell me why that happened or how it is even possible.
477706 477707
Note the gaps between the saw table and corners at the bottom and between the straight edge and corners above. I can slide more than 4 sheets of note paper under the corner, and that mikes out to .0012+. When the hinged box halves are closed, the gap is double that, so about 3/64"
I can laboriously hand sand them to get them true, but that doesn't help me to understand the problem and to avoid it recurring.
(Tried to edit the title, but can't. Obviously I am using a sander, not a dander.)