G0765 Chuck Upgrade

Dustin_Housel

Registered
Registered
Joined
Feb 8, 2016
Messages
22
I added some 4" chucks to mine but I keep keeping vibrations over 500 rpm. I've faced the spindle, backplate and the back of the chuck and I even took a skim cut on the OD and faced the front of the chuck. I'm at .001 runout when indicated on top of the chuck when spun at 300 rpm. It gets pretty violent over 500. Shakes machine. I've ran some screws through the chip tray to firm it up. I still have the rubber pads on bottom. It's the same issue with the new 3 jaw and 4 jaw. Backplates and chucks came from little machine shop. Any help would be appreciated.

Sent from my SM-G935V using Tapatalk
 
so your vibrations are coming from else where not the chuck
Motor maybe or pulleys?
 
I think you guys are on to something. I'll check that this evening. Is there a rule of thumb on tension? Like 1/2" of movement? I talked to grizzly about another issue and in discretely asked if the machines would handle a larger chuck and they said yes no problem. I know I've seen a lot of guys do it online. Just looking for that little detail on why MINE has to be the one with issues.

Sent from my SM-G935V using Tapatalk
 
Well I checked it out. It was loose. Had about 1/2" of play. Book said 1/8. The motor looked extremely crooked so I loosened everything up and tried like hell to level it out. Got close but when I tried to make the final tension with the two bolts on the motor side it would go crooked again. Anyways so I tried again. Got it close and the belt tight. Ran considerably better then it just shut off when I turned it up to 2000rpm. Good old plastic gears b4ad24d735b661616b87c1e41be8b9a5.jpg

Sent from my SM-G935V using Tapatalk

b4ad24d735b661616b87c1e41be8b9a5.jpg

b4ad24d735b661616b87c1e41be8b9a5.jpg

b4ad24d735b661616b87c1e41be8b9a5.jpg

b4ad24d735b661616b87c1e41be8b9a5.jpg

b4ad24d735b661616b87c1e41be8b9a5.jpg
 
Try it at those speeds without a chuck; see if you still get the shakes. Use process of elimination to determine the cause.


Steve Shannon, USA
 
Man that sucks. Looks like it's off to little machine shop again. I think they offer that part. Hopefully made of better quality plastic than OEM grizzly.
Something has to give, I would be glad that it's the motor gear and not one of the plastic gears in the head stock.

Sent from my XT1097 using Tapatalk
 
Got the new pulley in installed and belt tensioned. Put a new backplate on the 4 jaw. It was actually an interference fit on both the chuck and spindle! Runout was reduced to. 001 and vibrations greatly. I guess I'll take backplate off the 3 jaw and cut a new boss. Anyways here's a couple little projects I made! The brass part is a scribe. Just failed to get a pic with the scribe installed 2f96b30bfa07e82f5e0ebb762bff7fb3.jpgda61f98979156ac2111748e75d084fcf.jpg871f4c9037a9446183dda36baea5fe12.jpg

Sent from my SM-G935V using Tapatalk

2f96b30bfa07e82f5e0ebb762bff7fb3.jpg

da61f98979156ac2111748e75d084fcf.jpg

871f4c9037a9446183dda36baea5fe12.jpg

2f96b30bfa07e82f5e0ebb762bff7fb3.jpg

da61f98979156ac2111748e75d084fcf.jpg

871f4c9037a9446183dda36baea5fe12.jpg

2f96b30bfa07e82f5e0ebb762bff7fb3.jpg

da61f98979156ac2111748e75d084fcf.jpg

871f4c9037a9446183dda36baea5fe12.jpg

2f96b30bfa07e82f5e0ebb762bff7fb3.jpg

da61f98979156ac2111748e75d084fcf.jpg

871f4c9037a9446183dda36baea5fe12.jpg

2f96b30bfa07e82f5e0ebb762bff7fb3.jpg

da61f98979156ac2111748e75d084fcf.jpg

871f4c9037a9446183dda36baea5fe12.jpg
 
Had to make a spider chuck to hold barrels since my spindle is lacking in size. Lol1408f2232d06de58638db60481d50e73.jpg

Sent from my SM-G935V using Tapatalk
 
Yet another lathe/mill project. Tell me if you guys are tired of my posts! Made a 90 degree single point cutter for reaming and counter sinking holes. I ground a 10 degree relief on the cutting edge. Works great! Tempered to straw after oil quench. 3/8 O1 steel. Wanted a hand/machine tool. Enjoy!9a1ea38f32d2788d6b3f457c58ca36b7.jpgdbca372b5e8c97746cc31b394417f5b5.jpg804b6a0e3fdcb39a692829ffe812a8d9.jpg

Sent from my SM-G935V using Tapatalk
 
Back
Top