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5:23 PM
November 10, 2012
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At last! I've cut some metal!
Now to find a cheap place to buy a good QCTP from because I'm silly and don't have 1/2" tooling.
3:14 PM
November 10, 2012
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I can honestly say, Grizzly will NEVER see another penny from me.
The brand new power control cable to replace my damaged one arrived today, after being sent 2nd day air.
And by brand new I mean clearly taken off of an old machine with three cut wires and two damaged connectors. This one is in worse shape than the one that came in the lathe that shorted out and had damaged connectors.
12:36 PM
January 9, 2009
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Demented said
At last! I've cut some metal!Now to find a cheap place to buy a good QCTP from because I'm silly and don't have 1/2" tooling.
Hi Demented, you probably already know this, but just in case you don't I thought I'd mention that you don't need 1/2" tooling. You can shim 3/8" or 1/4" tooling to get it on centerline. I have a G0602 and don't use 1/2 inch tooling with it. I use 3/8".
A QCTP just makes life easier, but the stock 4-way tool post works well with a little patience and shimming.
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1:18 PM
November 10, 2012
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I know, I just find shimming all of the time to be a major pain in the ass. I finally did manage to get about 8 full hours of machining in on the lathe this weekend, though I can't wait for the new control wires to come from Grizzly so that I can finally close the panels up. Shame that it took reports to the BBB and FTC to get Grizzly to pull through and properly warranty a machine.
I did however have a weird problem which I'm hoping was just belt misalignment. At 1200RPM the lathe was shaking like hell, but only 1200RPM. I had a parting blade break about 30 minutes before so I was freaking out and thinking the spindle bearings are bad or something tweaked it and the chuck was out of balance, so I removed the chuck and the vibration was still there but much less. Out of curiosity I checked every other speed range and there was no issue. Just found that very strange.
1:55 PM
January 9, 2009
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Hmm, that is strange. Maybe its a pully or something that isn't perfectly balanced?
I don't know if I've ever ran my lathe at 1200. Maybe for polishing. Next time I'm in the shop I'll test mine to see if it has any issue.
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2:34 PM
November 10, 2012
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I was turning some small OD aluminum rods towards the end of what I was doing. I was just out making a little plug bolt for my drill chuck centre taper since ones threaded for drawbolts seem to be difficult to pop out of the tailstock and had no problems, but was only turning at 300RPM.
Though I did just go switch it back to 1200 to test out and sure enough, no vibration. Just a fluke I guess, unless a little 4" long 0.25"D aluminum rod would have thrown the balance that much out of whack.
4:09 PM
February 10, 2011
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Demented said
I know, I just find shimming all of the time to be a major pain in the ass. I finally did manage to get about 8 full hours of machining in on the lathe this weekend, though I can't wait for the new control wires to come from Grizzly so that I can finally close the panels up. Shame that it took reports to the BBB and FTC to get Grizzly to pull through and properly warranty a machine.
I did however have a weird problem which I'm hoping was just belt misalignment. At 1200RPM the lathe was shaking like hell, but only 1200RPM. I had a parting blade break about 30 minutes before so I was freaking out and thinking the spindle bearings are bad or something tweaked it and the chuck was out of balance, so I removed the chuck and the vibration was still there but much less. Out of curiosity I checked every other speed range and there was no issue. Just found that very strange.
Pretty much every machine will have some degree of this. It's a phenomenon usually caused by the rotational speed coming into coincidence with the resonant frequency of the moving parts, sub parts, or whole of the machine. The frequency relationship can be described in musical terms, there are directly divisible harmonics, i.e. halves, quarters, thirds, fifths, etc etc.
One other thing it could be is belt vibration, this can manifest itself as a droning sound too. The same applies, the belt will vibrate when the vibration frequency comes in line as above.
Your chuck is probably adding mass to the vibration, hence why it was worse with it on. It would be good to try and isolate the cause directly though if it's vibrating as badly as you suggest. Hopefully it was just your workpiece.
4:19 PM
November 10, 2012
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I'm pretty sure it was just something with the belt, since the changing of the belt on the pulleys is the only thing that has changed on the machine. It's gone now and hopefully wont be back, but if it does come back I will definitely isolate it. First time I've ever seen a vibration show on only one speed out of 7 years of working on lathes.
6:50 PM
January 9, 2009
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Good to hear it's sorted!
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3:40 PM
November 10, 2012
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Tyler said
Good to hear it's sorted!
Sadly, it's not. The 3rd attempt at Grizzly warrantying this lathe arrived at my door today. A used wire harness that has two cut wires and two butt connectors crimped onto said wires with vice grips.
I think it's time to get lawyers involved since having the BBB and FTC getting involved hasn't properly gotten Grizzly to step up their game.
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