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

[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.

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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

[m_c]

Sounds like chatter to me..

[spluppit]

Correct it is resonance. Either lower your rpm or up your feedrate.....a lot. This is where having a machine with no rigidity and physical weight plays a big part and restricts what you can do, there is only so far you can push a machine like that.