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XY table wroks!

A project log for Minamil 2dc: a minimal CNC mill

Each axis: ̶$̶5̶ ̶$̶8̶ $10 motor+lead screw, 3x LM6UU, 3x 6mm x 100mm rod, 1/8in hardboard, PC case screws

paul-mcclayPaul McClay 08/19/2020 at 09:550 Comments

already teased proto axes operating under load.

After those validated the basic idea cadded & cut parts for an XY table. Went together well and felt good in hand.

Today clamped the XY to a Dremel tool stand to run X&Y under fixed tool. Just faced 3x4mm because have that file because that's CDCNC work area. Also CDCNC run of that file highlighted cross coupling between - mainly - Y&Z with face areas in different planes depending on direction of cutter travel.

Worked great. Not detected anything out of plane. Faster feed than i think CDCNC ever went. Then tried deep cut (relatively) initially at low feed. Smelled bad, not surprisingly.  Tried increasing feed. But before got out of too slow got to first corner and noted missed a few steps on the way. So abort. Tried to get close to mm/2 depth of cut. Measured 1/64 in.

Got greedy
Tried a deep (relatively) cut

Expecting Z will need a counter weight. Even if can lift tool, still wouldn't be thrilled about wear on m3 screws.

Unexpected problem: the XY axes don't handle a descending load well but chatter. Tried some nut ideas. So can't swap XY into horizontal CDCNC layout. So thinking of vertical with counterweight/spring(near constant force) 

CADed some of that layout. Could be ~5x5x10in with a little complexity. Else not quite so small.

To do:Al?

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