Hello Guest it is September 21, 2019, 06:01:56 AM

Author Topic: Z AXIS KNEE  (Read 19042 times)

0 Members and 1 Guest are viewing this topic.

Re: Z AXIS KNEE
« Reply #40 on: November 16, 2008, 11:09:56 AM »
I put spiral cut hardened bevel gears in it. I never use it manually so i don't know if it would drop down or not if the servo is unpowered. I wish i had gone belt drive but hey, it works pretty good and makes money.

Where did you get the gears?  I'm actually very pleased with how mine works, I just want to make it quieter, and more durable.  The gears, I think, are a significant source of noise.  Other than that, it works great as-is - less than 0.0001" backlash, and excellent repearability.

Regards,
Ray L.
Regards,
Ray L.

Offline fast89

*
  •  137 137
    • View Profile
Re: Z AXIS KNEE
« Reply #41 on: November 16, 2008, 11:57:18 AM »
The gears are from MSC, they are off the shelf Boston Gear units. I had to modify them of course. Does yours have straight cut or spiral cut gears?  I don't think  these gears are much quieter than the original ones but i don't get the cogging noise from the old acme screw. The gears sound better at 150ipm than they do at 100ipm.....figure that one out.  Soon we'll see how they sound at 180ipm.
Re: Z AXIS KNEE
« Reply #42 on: November 16, 2008, 11:59:54 AM »
The gears are from MSC, they are off the shelf Boston Gear units. I had to modify them of course. Does yours have straight cut or spiral cut gears? I don't think these gears are much quieter than the original ones but i don't get the cogging noise from the old acme screw. The gears sound better at 150ipm than they do at 100ipm.....figure that one out. Soon we'll see how they sound at 180ipm.

Mine are straight-cut.  What kind of drive are you using to get 150 IPM?

Regards,
Ray L.
Regards,
Ray L.

Offline fast89

*
  •  137 137
    • View Profile
Re: Z AXIS KNEE
« Reply #43 on: November 16, 2008, 01:16:56 PM »
I'm using a gecko 320. I have run it at 150ipm but the pulse rate is too high to be reliable so i keep it around 100ipm.  It's only got a 250cpr encoder on it now but it's going to be a 120cpr encoder. The belt drive thru the original crank shaft is 2-1 reduction, then the gears are 2-1 reduction also.
Re: Z AXIS KNEE
« Reply #44 on: November 16, 2008, 01:20:17 PM »
I'm using a gecko 320. I have run it at 150ipm but the pulse rate is too high to be reliable so i keep it around 100ipm. It's only got a 250cpr encoder on it now but it's going to be a 120cpr encoder. The belt drive thru the original crank shaft is 2-1 reduction, then the gears are 2-1 reduction also.

What kind of motor?  My 850 oz-in peak servo will drive mine to 70+IPM, running through a 4.8:1 reducer.  I'm sure it will go somewhat faster (I currently have my SS limited to 128kHz step rate), but I doubt I'd make much over 100 at best.

Regards,
Ray L.
Regards,
Ray L.

Offline fast89

*
  •  137 137
    • View Profile
Re: Z AXIS KNEE
« Reply #45 on: November 16, 2008, 02:06:10 PM »
I'm running the same hopeshopcnc motor as you. Now that i think about it, i may have more than 2-1 gear reduction on the belt drive side. Might be 3-1?