LinkBack URL
About LinkBacks
Also, the CNCrouterparts motors are single shaft right? :\
| | |
Both of the kits use 380/381 oz/in motor.
The 380oz/in motor from CNCrouterparts has inductance of 4.1mH
The 381oz/in motor from Keling inductance is 2.8mH
From what i've read so far, for the same torque rating motor, the lower inductance the better. (as lower inductance would give higher corner speed - speed b4 the torque drops)
Can someone please share your thoughts?
I'm ready to order a kit to go forward with my plan.
Thanks
Also, the CNCrouterparts motors are single shaft right? :\
Yes, single shaft. The shaft can be ordered as 1/4" or 3/8".Originally Posted by mamexp
CarveOne
CarveOne
http://www.carveonecncwoodcraft.com
which kit would you prefer and why?
I'm impressed with the torque curve from CNCrouterparts but then the inductance of the Keling motor is much lower ? Which confuses me...
I have six of the CNCRP motors and none of the Keling motors, so I can't vouch for which is best. The lower inductance motors will probably run a little cooler due to lower inductive reactance.
CarveOne
CarveOne
http://www.carveonecncwoodcraft.com
I read that chart as 250oz-in of torque (1.8N-M) at the start, down to 200oz at 375rpm, then falling off quickly after that. Doesn't seem that impressive to me.
I have no experience with either one, but I'd try the Keling based on the inductance ratings.
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Thanks for your input. I have read few motor specs from in this range and 10000 pps seems high.
I will follow your what you said and try the Keling motor.
I plan to order the kit along with 3 wires (the red serial wires )
The kit from CNCrouterparts come with the red wires and the motor is prewired with resistor. Does that mean i need to get resistors to wire the motors?
10,000 pulses per second * 60 seconds = 600,000 pulses per second. With 1/8 stepping, there are 1600 steps/rev.
600,000/1600 = 375rpm.
Most torque curves use 1/2 stepping, so the pps would be 1/4 of what it is when 1/8 stepping at the same rpm.
pps by itself is really a meaningless number.
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
I know of one person here who has tried both and said the Keling steppers performed better then the CRP steppers.
I went with the kit from CRP only because of the ease of install and I got in on the sale fineline automation was doing on black Friday.
I have 280oz keling steppers and one CRP stepper and consider them equal in routing below 200IPM. I've never attempted to cut any faster than that. On the high end for rapids only, the Kelings can go faster without stalling. But in the end it's a wash because I have rapids tuned down to 400IPM and both can do more than that.
For a single start screw I would recommend Keling steppers but I wouldn't recommend a single start screw to anyone. If I was building a machine today I would go with CRP steppers and a 5start screw to simply avoid soldering.
I'm still new at this, can you please elaborate this part?
Are you talking about the connectors? or ...lead screw?
Your steppers turn your lead screw or ball screw or whatever. Most people use ACME screws for their first machines or smaller machines. A 1/2 one start screw has ten rotations to make a lead nut travel one inch. A 5 start screw has 5 threads and only takes 2 turns to make the lead nut travel 1 inch. So with a 5 start screw your machine can travel faster at a lower stepper RPM. A 5-start screw just gives you a good amount of speed and usable torque where a stepper on a single start screw would stall out.
The trade off for the speed and power is you loose resolution. Unless you will be doing some very fine detail work it shouldn't be something you will miss.
Posting Permissions
| | |
