New build concern lead screw whip?


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    Default New build concern lead screw whip?

    Hello I've just started a Joe,s 2006 R2 build I've been reading most all the forums and im concerned about the lead screw whip using a two start 1/2-10 or 1/2-8 acme rod why not use a single start 1-5 or a 1-4 acme rod. I know there will be a considerable weight difference but if i go with Nema 34 stepper motors ,878oz. the bigger motor should compensate for the extra weight right?


    Thanks for your time and all the info




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    How long are the screws? I have 60" 1/2-8 2 start and they whip a little when I'm at the end of travel, but I can run at 150ipm (600rpm) with them. I have a 40" screw on my Y axis and it doesn't whip at all, running at 190ipm (760rpm).

    Your much better off going with 1/2-8 4 start or 1/2-10 5 start instead of 1". You'll won't need bigger motors, and you'll get better performance. 1/2" 4 or 5 start is almost twice as efficient as a 1" acme screw.

    Gerry

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    A 1-4 acme would be equal to your two start 1/2-8 one 360 degree turn would move .250 unless with the increased rotating mass I end up with the same problem.



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    cnctom, rotating mass is the entire problem. Increase mass at same RPM and you will get more whip.



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    Increase mass at same RPM and you will get more whip.
    Not if you increase diameter.

    As I mentioned above, the multistart 1/2" screws are much more efficient than the 1" single start screw. While they have the same lead, you'll get the same if not better performance using smaller motors. So, you'll save money on both motors and screws.

    How long are the screws on that machine? If they are less than 4 feet, then whipping shouldn't really be an issue with multistart screws.

    Gerry

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    they are about 60 inchs. That is what is on my joescnc2006, and mine is a 1/2 5start. cannot feel any whiping at 250ipm.



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    If they are 60", then I'd definitely go with the 4 or 5 start 1/2", rather than the 1" dia. Lots of members here have gone that router with no whipping issues, and you'll get double the speed you'd get with 1" screws, for less money.

    Gerry

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    yes I would go with the 1/2" 5 start, they work really well, and the resolution for the machine will be just fine.

    Thanks,
    Joe

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    joecnc2006 at yahoo


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    Lightbulb

    More parts with work being slow right now im taking advantage of time. I've been reading allot now. Here's the situation I live in Wisconsin therefore winters are flipping cold! Check it out its warmer in Anchorage Alaska than it is in Wisconsin, wife wont move enough said! So my garage is hard to heat at -5 to -25 degrees. Last year i finished our basement there for i have no warm place to work. This build has two purposes in the summer witch last about 60 day ha ha. im going to use this in my garage as a router and in the other ten months of winter ha ha it will be used as a 3d printer with at least three to four different nozzles for different colors. i'm modifying the z to have 10 inches of travel built out of aluminum so i can palatalize my Z attachments. Im also going with 1-3/8" dia. 1045 Turned, Ground & Polished (+000/-.001) rod for the four X ways and 1"dia. for the y axis. So i need the best of both worlds accuracy (high resolution) and speed. I know i cant have the best of both worlds. So your saying a 1/2 five start would get me decent speed but probably medium accuracy. I've accepted that i'm going to have to go with two lead screws one for 3d routering and one for 3d printing. I am also leaning towards captive lead screw (rotating nut) To eliminate all whip has anybody gone this rout with Jo's 2006 r2 (which is an awesome design Jo) if so can anybody point me into there build. Thanks everybody for all the info.







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    You'll get plenty of accuracy from the 5 start screws. You'll actually get a lot more than any 3d printer that uses belt drive, which I think most do.

    Actually, the term you're looking for is resolution, not accuracy.

    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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    Default Re: New build concern lead screw whip?

    Well It's winter in Wisconsin again boy was summer short. I've got back to work on my project again. I just got done ordering the Gecko G540 3 Nema23 Steppers 620 oz/in with Mach3 included and a Antek PS-4N48 - 400W 48V Power Supply. Also the three 1610 Ball screws and 16MM Bearing Block linear slide guides 2 rail+4 SBR16UU for the Z axis and nema 23 mounts brackets. Expensive evening. I used turned ground and polished 1045 shafting instead of well pipe for a smoother run. I also milled up solid bearing carriers it was a lot of drilling and tapping and grinding but it was good fun.






    http://vid1314.photobucket.com/album...psloiagvjb.mp4



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    Default Re: New build concern lead screw whip?

    Quote Originally Posted by cnctom View Post
    Well It's winter in Wisconsin again boy was summer short. I've got back to work on my project again. I just got done ordering the Gecko G540 3 Nema23 Steppers 620 oz/in with Mach3 included and a Antek PS-4N48 - 400W 48V Power Supply. Also the three 1610 Ball screws and 16MM Bearing Block linear slide guides 2 rail+4 SBR16UU for the Z axis and nema 23 mounts brackets. Expensive evening. I used turned ground and polished 1045 shafting instead of well pipe for a smoother run. I also milled up solid bearing carriers it was a lot of drilling and tapping and grinding but it was good fun.






    http://vid1314.photobucket.com/album...psloiagvjb.mp4


    So can i assume that a 1/2 10 5 start acme screw will be ok with a machine that is 6 feet long by 5 feet wide thats my build and im geting replies that ill get to much whipping



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    Quote Originally Posted by explore View Post
    So can i assume that a 1/2 10 5 start acme screw will be ok with a machine that is 6 feet long by 5 feet wide thats my build and im geting replies that ill get to much whipping
    I went with a eBay ball screws and have no whip at all, I did pre tension all the ballscrews with custom bearing holders. Good fun.



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    Default Re: New build concern lead screw whip?

    Quote Originally Posted by cnctom View Post
    I went with a eBay ball screws and have no whip at all, I did pre tension all the ballscrews with custom bearing holders. Good fun.
    Hi are they long screws and can you give a link to your itewm so I can see what I have noware acme 1/2 10 1 start buess will upgrade them
    now but to what exacly i was thinking on geting 1/2 10 5 start 72 inches



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New build concern lead screw whip?

New build concern lead screw whip?