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Author Topic: gecko540 problem under mach3  (Read 14606 times)

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Re: gecko540 problem under mach3
« Reply #40 on: October 10, 2011, 02:15:32 PM »
 have a 3'' blocks each
Re: gecko540 problem under mach3
« Reply #41 on: October 10, 2011, 02:22:59 PM »
I noticed the problem is also in the end mill , if the end mill is a little pushed in COLLET runs to the side , and it also gives the parts is larger 0.06mm  on both axes
Hi Komar,

0.06mm is a fairly small error which can be a result of the machine stiffness /  feed / rpm / cutter condition.

Does your program have a roughing pass, then a finishing pass (maybe several finish passes) and then a spring pass?
For an accurate 30.0mm bore I'd normally rough out to within 0.25mm, take 2 finishing passes at 0.125 each and then a following spring pass.
To take into account cutter wear, flex of the machine and tool holder, you'd also need to have cutter compensation to adjust the finished size.

I had a quick look through the old posts of this thread and can't see any details of the material / thickness  / type of cutter you are using.

ATB
Derek



You can "chop it off" but can't "chop it on"
Re: gecko540 problem under mach3
« Reply #42 on: October 10, 2011, 02:41:11 PM »
block is about 3''is a 76.2mm I told the machine to go the distance 76.2 machine is not reached at this distance

I had to move manually it about 0.51 more, that indicator showed me a zero
Re: gecko540 problem under mach3
« Reply #43 on: October 10, 2011, 02:49:44 PM »
I noticed the problem is also in the end mill , if the end mill is a little pushed in COLLET runs to the side , and it also gives the parts is larger 0.06mm  on both axes
Hi Komar,

0.06mm is a fairly small error which can be a result of the machine stiffness /  feed / rpm / cutter condition.

Does your program have a roughing pass, then a finishing pass (maybe several finish passes) and then a spring pass?
For an accurate 30.0mm bore I'd normally rough out to within 0.25mm, take 2 finishing passes at 0.125 each and then a following spring pass.
To take into account cutter wear, flex of the machine and tool holder, you'd also need to have cutter compensation to adjust the finished size.

I had a quick look through the old posts of this thread and can't see any details of the material / thickness  / type of cutter you are using.

ATB
Derek






ALUMINIUM TOOLING PLATE  3/4 END MILL CARBIDE

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Re: gecko540 problem under mach3
« Reply #44 on: October 10, 2011, 03:05:04 PM »
""block is about 3''is a 76.2mm I told the machine to go the distance 76.2 machine is not reached at this distance I had to move manually it about 0.51 more, that indicator showed me a zero """



OK that tells me either your steps per unit  is wrong OR you are loosing steps. Calculate the % of error of the move then adjust the steps per by the same amount and try again. IF you repeat the exact test 10 times will it be consistantly off by the same amount???

The test you did shows and error of .67% (.0067) so you would need to raise the Steps per from 400 to about 402.68

If you can get the accuraccy to be constant with a steps per adjustment then you have your answer. IF it still comes and goes then you are loosing/gaining  steps from another part of the process.  TEST(repeatedly) and eliminate 1 thing at a time.

(;-) TP



« Last Edit: October 10, 2011, 03:08:51 PM by BR549 »
Re: gecko540 problem under mach3
« Reply #45 on: October 10, 2011, 03:16:48 PM »
3/4" is a VERY large tool to be using on a little X3.....

Regards,
Ray L.
Regards,
Ray L.
Re: gecko540 problem under mach3
« Reply #46 on: October 10, 2011, 03:23:24 PM »
3/4" is a VERY large tool to be using on a little X3.....
Regards,
Ray L.
What I was thinking - I'd be only using a 10mm cutter on my bridgeport.
8mm would be a better size on the X3.
ATB
Derek
You can "chop it off" but can't "chop it on"
Re: gecko540 problem under mach3
« Reply #47 on: October 10, 2011, 03:33:41 PM »
I have 6 mm end mill
Re: gecko540 problem under mach3
« Reply #48 on: October 10, 2011, 04:19:58 PM »
set the machine at 402.68  This was a little too much the ok  is on 402  at a distance 76.2mm  but when I measured the distance to 2'' 50.80mm
machine is not reached at this distance traveled only to 50.60mm error  is .0.20mm  and this is the problem, if you  set to a distance, on the other distance is the error
Re: gecko540 problem under mach3
« Reply #49 on: October 10, 2011, 04:42:31 PM »
OK, try this:

Tell it to move 1"/25.4mm, measure exactly how far it DID move.
Return to 0.000.  Does it return to 0.000?
Tell it to move 2"/50.8mm, measure exactly how far it DID move.
Return to 0.000.  Does it return to 0.000?
Tell it to move 3"/76.2mm, measure exactly how far it DID move.
Return to 0.000.  Does it return to 0.000?
Do each of these 3 times, and report ALL the numbers.

Regards,
Ray L.
Regards,
Ray L.