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Thread: 4x8ft CNC router - steppers, drives and sanity check

  1. #81
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    Default Re: 4x8ft CNC router - steppers, drives and sanity check

    DANIELLYALL,

    Thanks man, it works like a champ. I've used it several times already.


    The little 1hp router is getting replaced tomorrow. The bearings are shot, I have about 0.020" total axial play, it won't reliably hold a 1/4" endmill without pulling out no matter how much I tighten the collet nut. Since I do not have the spindle money yet, neither have I done the research, I couldn't turn down a great deal on a 2.25hp porter cable, 10k-23krpm with a 1/2" and 1/4" collet. It's not a spindle, but it SHOULD be a huge improvement.

    I just finished a $300 job this morning. That was a lot of work..... and a couple retail type ideas my wife had which the bit pulled out on one and ruined a beautiful piece of oak.



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    Default Re: 4x8ft CNC router - steppers, drives and sanity check

    the porter cable router should last more than long enough for you to save up of a good one

    <img src="https://ivxo1q-dm2305.files.1drv.com/y4mENMmTr_Cabc7pR0FUdB6gtbADq2JbuG4_rGy0eBQvLJx19pTi6TqMUIJN0xgOyDIc0gWoxYhS38HpbSTFGdfaK-o42IOU6jczrhDpfpCOTNGL1X6hvZCbgj0y35gqmq1YGTrWwShYGV-C7lXA2esy0Pi_WfnBSyroDLSGXwce4uSr1U7op7srdi78rispHCa_K4aFlTlJPVkkNWMfgh_Tg?width=60&height=60&cropmode=none" width="60" height="60" />

    Being Disabled is OK CNC is For fuN


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    Default Re: 4x8ft CNC router - steppers, drives and sanity check

    It's been nearly a year. I've learned a lot, collected a lot of experience, found a small flaw in my machine and replaced one bearing.
    The Porter Cable 2.25Hp router is still running strong and will power through everything I've cut with ease. There's no noticeable bearing wear either.

    I have about 500hrs cut time on the machine, got the feeds and speeds dialed in, which is nice cause the first endmill lasted about 500 inches of cut. They're lasting a mile in plywood now.

    The machine is brutal, incredibly strong and I couldn't have asked for any more. I'm still running reduced current, I see no reason to increase the current since I have such an abundance of power.....


    Anyways, I'm building a second machine now. The size and design is the same. There are a couple ease of maintenance improvements made and the new machine is a lot more sexy.

    I do have one question though. I'm running a 42V 20A power supply on the old machine, digital drives and 3.3mh inductance motors at 4.5A through a 3:1 reduction. I can easily rapid at 600ipm half step. but according to the calculator linked below, I should only be able to attain 200ipm. Any ideas?
    Stepper Motor Calculator

    FYI I'm going to run a 48V supply on the new one.... but performance will be the same as 42V I'm sure.

    Thank you all again,



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    Default Re: 4x8ft CNC router - steppers, drives and sanity check

    have a look at the gecko web site they have good stepper info

    <img src="https://ivxo1q-dm2305.files.1drv.com/y4mENMmTr_Cabc7pR0FUdB6gtbADq2JbuG4_rGy0eBQvLJx19pTi6TqMUIJN0xgOyDIc0gWoxYhS38HpbSTFGdfaK-o42IOU6jczrhDpfpCOTNGL1X6hvZCbgj0y35gqmq1YGTrWwShYGV-C7lXA2esy0Pi_WfnBSyroDLSGXwce4uSr1U7op7srdi78rispHCa_K4aFlTlJPVkkNWMfgh_Tg?width=60&height=60&cropmode=none" width="60" height="60" />

    Being Disabled is OK CNC is For fuN


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    Default Re: 4x8ft CNC router - steppers, drives and sanity check

    Quote Originally Posted by daniellyall View Post
    have a look at the gecko web site they have good stepper info
    Gecko is one page I researched last night before posting the question. My condition is obviously not magical, so as long as it works as well as it does I'm ok with not understanding the math.

    Thank you for the advice.



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    Default Re: 4x8ft CNC router - steppers, drives and sanity check

    If voltage is your concern why? Stepper drives limit the amps to the steppers. Power is watts. V*A=Watts. More volts is more power but you may have motor heat problems. The China machines are usually 80 volts. The stepper drives are limited as to the voltage that they can take. Keiling drives (read Leadshine®) come in various voltage capacities.

    If you are building from scratch go with the highest voltage you can stand. I'm talking price of the drives. The stepper motors really don't care.

    Bob
    sscncrouter.com



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    Default Re: 4x8ft CNC router - steppers, drives and sanity check

    I can easily rapid at 600ipm half step. but according to the calculator linked below, I should only be able to attain 200ipm. Any ideas?
    Yeah, that calculator is no good.
    If you change the 200 steps per rev to 2000, then the rpm's decrease by a factor of 10. So #1, the steps per rev shouldn't be used in their calculation.

    #2, there's no information about the drive system, or the weight being moved. If you don't know what the motor will be doing, how do you know how fast it will go.

    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)


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    Quote Originally Posted by spiral72 View Post
    It's been nearly a year. I've learned a lot, collected a lot of experience, found a small flaw in my machine and replaced one bearing.
    The Porter Cable 2.25Hp router is still running strong and will power through everything I've cut with ease. There's no noticeable bearing wear either.

    I have about 500hrs cut time on the machine, got the feeds and speeds dialed in, which is nice cause the first endmill lasted about 500 inches of cut. They're lasting a mile in plywood now.

    The machine is brutal, incredibly strong and I couldn't have asked for any more. I'm still running reduced current, I see no reason to increase the current since I have such an abundance of power.....


    Anyways, I'm building a second machine now. The size and design is the same. There are a couple ease of maintenance improvements made and the new machine is a lot more sexy.

    I do have one question though. I'm running a 42V 20A power supply on the old machine, digital drives and 3.3mh inductance motors at 4.5A through a 3:1 reduction. I can easily rapid at 600ipm half step. but according to the calculator linked below, I should only be able to attain 200ipm. Any ideas?
    Stepper Motor Calculator

    FYI I'm going to run a 48V supply on the new one.... but performance will be the same as 42V I'm sure.

    Thank you all again,
    Using a combination of dc drivers on a 48v 800w psu for your smaller motors and an ac drivers on a toroidal for your larger motors is how I got around the wattage and current issues using single phase. I use a 55v toroidal for the nema 34,s, not sure of the rpm but getting 400 is on 20mm pitch screw, Imagine the motor would do 600 ipm mechanics permitting.



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4x8ft CNC router - steppers, drives and sanity check

4x8ft CNC router - steppers, drives and sanity check