Parts 0.050" to big in X and Y

[donek]

When trying to make dimensional parts that must be dead on, you should always make a cleanup cut. This means you first cut the part oversized and then cut it to dimension. This will produce a better part finish and generate less tool/machine deflection. Since you are using a public machine, this will likely be your best practice moving forward. You have no idea how much abuse this machine is seeing, so always assume the worst.

[Scott216]

When trying to make dimensional parts that must be dead on, you should always make a cleanup cut. This means you first cut the part oversized and then cut it to dimension. This will produce a better part finish and generate less tool/machine deflection. Since you are using a public machine, this will likely be your best practice moving forward. You have no idea how much abuse this machine is seeing, so always assume the worst.

That's a good idea. For 1/2" plywood how much stock do you think I should leave for the finish pass, 0.010"?

[donek]

That's a good idea. For 1/2" plywood how much stock do you think I should leave for the finish pass, 0.010"?

It's going to depend on your first cut direction. If you climb cut on your first pass, bit and machine deflection will be away from your finsished vector. You could simply climb your first cut and conventional cut you finish pass. If you conventional cut both passes, you would need to know you machine a bit better, but I would typically use a 0.05in offset on my first pass.

[gc3]

my pass strategy in 1" solid panels...