Reply with Quote380oz motors tend to be faster than the 425 oz motors. Look at the rack and pinion components from cnc router parts. With 380oz motors and rack and pinion, you can get 500+ipm.
Possibility of 200-300 ipm speed
Hi Everybody !
I just see this video on youtube:
I estimate the speed of this CNC near to 300ipm ( block of wood mesure 16inch and it's take 3sec to do it's all length ).
This speed look like really nice for me. For now I have a cheap MDF CNC and it's go at 40-50ipm with hardware lead screw and 285oz-in stepper.
I plan to build a new one with iron for the base and aluminium for gandry with probably chain drive and 425oz-in stepper.
It's possible to achieve this speed on a 4'x8' table with a nema24 425oz-in stepper ( chain drive or pinion rack drive ) ?
Somebody already experienced this feed rate of engraving or know somebody already doing this on a DIY machine ?
thanks a lot !
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380oz motors tend to be faster than the 425 oz motors. Look at the rack and pinion components from cnc router parts. With 380oz motors and rack and pinion, you can get 500+ipm.
Gerry
UCCNC 2017 Screenset
[URL]http://www.thecncwoodworker.com/2017.html[/URL]
Mach3 2010 Screenset
[URL]http://www.thecncwoodworker.com/2010.html[/URL]
JointCAM - CNC Dovetails & Box Joints
[URL]http://www.g-forcecnc.com/jointcam.html[/URL]
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
So , 4'x8' cnc with 380 or 425oz-in stepper can achieve this kind of engraving speed ( 200 - 300 ipm ) like in the above video ?
Rack and Pinion is really faster than chain drive system ( with or without gear reduction )?
PyroEvil
The machine in the video, is made in India, ( Mostly steel frame ) it has 900mm x 1200mm x 150mm travels, they are using Ballscrews on all axes, the motors are Hybrid Micro Stepper Motors on that machine, Which would be about the same cost as using servo
Mactec54
I have the 380 nema 23's on my R&P Joes Hybrid. I'm removing material with a 1/2 BN cutter at 500 IPM
[FONT="Times New Roman"]Darryl[/FONT]
[URL="http://www.cnczone.com/forums/open_source_cnc_machine_designs/144485-you_might_redneck_if.html"]Redneck CNC[/URL]
Rack and pinion and chain drive would be comparable with regards to speed, but rack and pinion is far superior to chain drive, as far as smoothness and consistency.Rack and Pinion is really faster than chain drive system ( with or without gear reduction )?
Reduction should be used with either method.
Gerry
UCCNC 2017 Screenset
[URL]http://www.thecncwoodworker.com/2017.html[/URL]
Mach3 2010 Screenset
[URL]http://www.thecncwoodworker.com/2010.html[/URL]
JointCAM - CNC Dovetails & Box Joints
[URL]http://www.g-forcecnc.com/jointcam.html[/URL]
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
IBBruin: Nice cnc! I never thinking a 380oz-in stepper can support this feedrate speed. So your cnc can do exactly what the other in the video did ? Gear ratio on you cnc or directly connected to stepper? Thanks a lot for sharing your video.
ger21: So rack and pinion is the best choice. What is the pro and cons of rackpinion and chain? I read chain system with a good tension have a low backlash , it's true ?
I can't say it will do exactly what the other one did since I've never tried it. I do cut 2.5D all the time at 250 ipm. I have set my rapids to 900 ipm by playing with the motor tuning but I never leave it there. I have the standard R&P drives from CNCRouterparts.
[FONT="Times New Roman"]Darryl[/FONT]
[URL="http://www.cnczone.com/forums/open_source_cnc_machine_designs/144485-you_might_redneck_if.html"]Redneck CNC[/URL]
you reduce ratio or directly connected to you stepper? you probably use acme screw system if I remember Joes Hybrid model.Originally Posted by IBBruin
I have a rack and pinion drive on my setup. Even though I can achieve 1,000 ipm I regret using rack and pinion due to its lack in accuracy. Typical pinion gears don't come in a precision ground form that I can find. When I can afford to I will be upgrading to ballscrews. IMO if you make parts that you want to be to spec, and not just visual look, then go with something that has a stated precision tolerance.
Any body know a web link or can tell me a list of pro and cons of each system ( pinion/rack vs chain ).
-I know ballscrew/leadscrew system is not suitable for big CNC ( 4' x 8' in my case ) because it's need a large diameter screw to make it stable ( my current cnc is just 4' long and the screw swing a lot ).
-Chain system apparently don't have or have small backlash ... it's true ?
tkubic: Thanks for the advice ! It's the kind of info I'm searching for !
Take a look at this
http://www.cncrouterparts.com/which-...ack-and-pinion
-drive-p-99.html
Here is a link explaining our R&P system Which is better, a screw or rack and pinion drive? | CNCRouterParts
We would be happy to talk with you about our reduced pulley system and our PRO Linear motion system that really lets our R&P move accurately.
Cory
CNC Router Parts
I typically cut 3d parts at 100ipm because I have a different Z axis and I'm speed limited because of the screw pitch. I'm planning on making a new Z axis with a ball screw so can try and get 200-250 ipm while cutting 3d parts. If your machine is rigid enough to handle the change in motion then yea I would see no problem cutting at 300ipm on a cnc router parts rack and pinion setup. I've jogged mine at 600 ipm and cut my spoil board at 250 ipm, but I tend to slow things down for a better cut.
Chains are for bicycles not cnc's
My CRP 48 x 48 build [URL=]http://www.cnczone.com/forums/open_source_cnc_machine_designs/144173-crp_4x4.html[/URL]
