Random Thought Thread

TRfromMT said:
I'm making a basic assumption that the Mori has a sophisticated VFD, and you have worked out the tuning/configuration of ramp rates and power limiting factors.
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Not really a VFD but sort of. The spindle motor is kind of a servo motor and the drive is sort of a big servo drive/amp. I guess it's a "C" axis? Encoder feedback and everything. The purpose of this is to interpolate spindle rotation with axis movement for things like rigid tapping. This prolly simplifies things like orientation for the tool change, but (for shlups like me) it complicates adjustments because, unlike a regular VFD, it's all digital. Which requires parameter documentation beyond the basic information that ships with the machine. Which is, in-and-of-itself, thousands of pages of technical words diarrhea. I hurt my brain skimming it all over the weekend.

Not an ideal solution but this is working. Without getting a larger power source ($$$$) I was hoping to add capacitance to cover the ramp up, but it was going to require over 50,000 joules of energy which was gonna take a capacitor the size of a refrigerator. So yeah, nope…

So I asked around and found some information about modifying the drive parameters and have modified the accel to 1/4th, which slowed the ramp rate down to about that of the other machines in the shop. It takes a few seconds to hit 14,000 RPM, but it doesn't dim the lights anymore.

Thanks y'all for the brain storming.
 
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Springtime in Tennessee
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Nathan the Machinist said:
So I asked around and found some information about modifying the drive parameters and have modified the accel to 1/4th, which slowed the ramp rate down to about that of the other machines in the shop. It takes a few seconds to hit 14,000 RPM, but it doesn't dim the lights anymore.
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Really, really happy for you that you were able to overcome the problem so quickly, bet ur one happy(ier) guy now...!
 
betzner said:
Really, really happy for you that you were able to overcome the problem so quickly, bet ur one happy(ier) guy now...!
Click to expand...

There was also the problem with the RS232 setup (which I've done a dozen times before without any trouble) and modifying the chip conveyer to attach to (and dump from) the other side. And there was some runout in the spindle taper from uneven wear due to a misadjusted tool changer that required dusting a few tenths from the spindle taper (now measuring .0004" at the end of a longass test bar). It is a used low hour machine (new it cost as much as my house) so it needed some love, but everything works extremely well now. This Mori is literally the highest performance machine tool I've ever operated (or even been in the same room as) so I'm pretty stoked about getting it into production. We're about there with it now, I'm setting it up to start tomorrow.
 
Nathan the Machinist said:
There was also the problem with the RS232 setup (which I've done a dozen times before without any trouble) and modifying the chip conveyer to attach to (and dump from) the other side. And there was some runout in the spindle taper from uneven wear due to a misadjusted tool changer that required dusting a few tenths from the spindle taper (now measuring .0004" at the end of a longass test bar). It is a used low hour machine (new it cost as much as my house) so it needed some love, but everything works extremely well now. This Mori is literally the highest performance machine tool I've ever operated (or even been in the same room as) so I'm pretty stoked about getting it into production. We're about there with it now, I'm setting it up to start tomorrow.
Click to expand...

Dang! This sounds really exciting! Looking forward to hearing about this puppy working for you. Mike
 
Nathan the Machinist said:
There was also the problem with the RS232 setup (which I've done a dozen times before without any trouble) and modifying the chip conveyer to attach to (and dump from) the other side. And there was some runout in the spindle taper from uneven wear due to a misadjusted tool changer that required dusting a few tenths from the spindle taper (now measuring .0004" at the end of a longass test bar). It is a used low hour machine (new it cost as much as my house) so it needed some love, but everything works extremely well now. This Mori is literally the highest performance machine tool I've ever operated (or even been in the same room as) so I'm pretty stoked about getting it into production. We're about there with it now, I'm setting it up to start tomorrow.
Click to expand...
Such a blindingly obvious solution! This went so far above my head you could fit several galaxies in the gap.
Take away point: 1.Move went safely, 2.Nathan make knife faster.
 
Got the new Mori into production today. Its first task is trimming out the Medium Choppers, going to get a bunch of those out to heat treat this week. Once we get that operation caught up I have a special project for it.
 
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