Newbie looking at 6040 (China CNC) for polypropylene 15mm sheet

[JOGARA]

8mm DOC, 0.5mm max stepover.
Cut fine, no noise, looks like I can go deeper.
Going to attempt 1mm. Can always pull it back.

This is much better than the 1hour+ than before. Down to 15mins now :)

The spindle is out but only by a hair. I can feel on the contour pass a slight line going around 2 sides of the part.
I have lowered the contour pass to take 4 depths instead of 2, this fixed that problem last time.










I am also getting this again on the contor. I have a 10mm finishing overlap. But I used default lead-in. I have upped that to 2mm. Hopefully that stops that.



And yes, I forgot to go -0.1mm on the contor pass so there is a bur going around the bottom of the part. The roughing pass went -0.2mm, so I normally set -0.1mm for the finishing endmill.

[Snapper]

Are you using tooling plate to cut your parts from? That must be costing you a bloody fortune!

[Chaz]

Are you using tooling plate to cut your parts from? That must be costing you a bloody fortune!

Its not much more than standard Alu. The fact that its reasonably flat has many benefits.

[JOGARA]

Its not much more than standard Alu. The fact that its reasonably flat has many benefits.

This /\


Wanted to reduce my machining time so was faster to have the top and bottom already finished.
That being said, sometimes one side does have marks on it that won't work for a finsihed product.
Most of the time it is only on one side so I mill into that side while leaving the pretty face the to outer face that I see.

What I might be moving towards is bar stock so I can grab it in my vice and not have to glue my stock to a large plate.
Though I like maching the top and bottom at the same time as there are 4-5 tool changes.

If I have ATC then that would not be a problem...

[Snapper]

Its not much more than standard Alu. The fact that its reasonably flat has many benefits.

Maybe for little odd jobs but for production? At a guess it's about 50% dearer than just buying a bar isn't it?

[JOGARA]

Maybe for little odd jobs but for production? At a guess it's about 50% dearer than just buying a bar isn't it?

Going off AW, 5083 bar worked out more expensive than Plate.
Both cut to size.

This is AW though...

[JAZZCNC]

Maybe for little odd jobs but for production? At a guess it's about 50% dearer than just buying a bar isn't it?

Nowhere near 50% more like 10% if that and the savings in machine time can easily justify that. I rarely buy bar stock anymore

[JOGARA]

Keep getting this strange behaviour from the machine.

Just keeps stuttering, even when just going along a straight path on 1 axis it will judder a lot.
Does it every so often and most of the time I have to turn it off and on again.

Any ideas?

[JOGARA]

Keep getting this strange behaviour from the machine.

Just keeps stuttering, even when just going along a straight path on 1 axis it will judder a lot.
Does it every so often and most of the time I have to turn it off and on again.

Any ideas?

https://photos.app.goo.gl/uAcR70B7vQtYLvs22