Chester 20v and G0704 comparison - Page 2


Page 2 of 3 FirstFirst 123 LastLast
Results 13 to 24 of 27

Thread: Chester 20v and G0704 comparison

  1. #13
    Member
    Join Date
    Sep 2017
    Location
    United Kingdom
    Posts
    7
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    Dear GarageCNC,
    I Live in Scotland, and have recently bought the same Mill (Chester 20Vs.) am converting to CNC.Need help with sizes etc of the Ballscrews and the nuts.
    i.e specification, lengths etc and how what support bearings you used.

    Look forward to your kind reply.
    Yours sincerely. Mechan6



  2. #14
    Member
    Join Date
    Dec 2015
    Posts
    348
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    This thread hasn't been updated in 8 years so getting info from OP might be tough.

    I want to say that most people use a 16mm by 5mm (5tpi) ball screw on their G0704's. As for lengths I do not know, maybe ArizonaVideo or another poster with experience will chime in.



  3. #15
    Member
    Join Date
    Jan 2018
    Location
    United Kingdom
    Posts
    199
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    Quote Originally Posted by Mechan6 View Post
    Dear GarageCNC,
    I Live in Scotland, and have recently bought the same Mill (Chester 20Vs.) am converting to CNC.Need help with sizes etc of the Ballscrews and the nuts.
    i.e specification, lengths etc and how what support bearings you used.

    Look forward to your kind reply.
    Yours sincerely. Mechan6
    If it's this one I would have avoided it and looked at Amadeal for a belt drive machine with R8 taper.
    https://shop.chesterhobbystore.com/c...=7466463002671

    As for ballscrews I don't know lengths but recommend using 1605DFU.
    You'll have to measure it up and see what suits.
    You could get them custom made at cost to fit the machine then just add your own motor/nut mounts.

    If you go for the Chinese ones already end machined then you want to make your own bearing mounts too and fit 32x12x10mm AC bearings. Thrust bearings don't sit well on them at all.



  4. #16
    Member
    Join Date
    Mar 2017
    Posts
    18
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    On my PM-25 (very similar in size), I used 750mm 1605 double nut on X, 350mm 1605 double nut on Y, and 600mm 1605 single nut on Z.



  5. #17
    Member
    Join Date
    Dec 2012
    Location
    Norway
    Posts
    328
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    Quote Originally Posted by shooter123456 View Post
    On my PM-25 (very similar in size), I used 750mm 1605 double nut on X, 350mm 1605 double nut on Y, and 600mm 1605 single nut on Z.
    I would suggest to use 2005 screw for Z instead of 1605. This is what Hoss recommended.



  6. #18
    Member
    Join Date
    Sep 2017
    Location
    United Kingdom
    Posts
    7
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    Dear dazp1976,
    Many thanks for your kind reply and advice, much appreciated.

    I will look for the 1605DFU ballscrews.

    And at making the bearings mounts to suit the 32 x 12 x 10mm Angular Contact Bearings.

    Yours sincerely.
    Mechan6



  7. #19
    Member
    Join Date
    Mar 2017
    Posts
    18
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    You can do 2005, no harm there.

    From all the spec sheets I have seen, the 1605 will have a dynamic load rating around 600 kgf. With a 75lb head (standard weight was around 55 lbs, then air cylinder and heavier motor added), when accelerating upwards at 150in/s^2, the load will be around 462 N * coefficient of friction from the ways. 462 N is 47 kgf, meaning the 1605 can handle 12 times what is being asked of it. Unless my math is very wrong or I am missing something, the 1605 is more than sufficient.



  8. #20
    Member
    Join Date
    Jan 2005
    Location
    USA
    Posts
    1860
    Downloads
    2
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    I use 5/8" diameter, 0.2" pitch Thompson rolled ballscrews on all axes of my G0704. These are pretty close to the 1605 metric and they have never given me any problem. I'm going to be using a 2005 screw for the head on my RF-45. The RF-45 is a lot bigger machine and I even think the 1605 would be sufficient here, but there was not much price difference and plenty of room. On the G0704, cramming a 2005 ballscrew, nut, and mount into the little column is going to be pretty tight. If I were going to do another G0704 size machine I'd still use 1605 ballscrews on all axes.



  9. #21
    Member arizonavideo's Avatar
    Join Date
    May 2008
    Location
    USA
    Posts
    1151
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    For the RF-45 go ahead and run the 25mm. It will last longer.

    youtube videos of the G0704 under the name arizonavideo99


  10. #22
    Member
    Join Date
    Sep 2017
    Location
    United Kingdom
    Posts
    7
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    Dear 109jb.
    Many thanks for yours and everybody's advice much appreciated.
    All I got to do is collate them all. work out the lengths.
    Then find a supplier as I live in North Scotland.
    Best wishes.
    Yours Mechan6



  11. #23
    Member
    Join Date
    Sep 2017
    Location
    United Kingdom
    Posts
    7
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    Dear dazp1976,
    Thank you for your advice.
    As regards using the 1605DFU ballscrews.
    Not heard of that classification, but will look it up.
    I was thinking of using Two RK12 End support pre-loaded angular contact bearings on each end of the X Axis.
    As one end is motor driven other has a the handwheel.
    Thanks again, Best wishes.
    Mechan6



  12. #24
    Member
    Join Date
    Sep 2017
    Location
    United Kingdom
    Posts
    7
    Downloads
    0
    Uploads
    0

    Default Re: Chester 20v and G0704 comparison

    Dear Stigoe,
    many thanks for the advice concerning the 2005 Ballascrew for the Z axis .
    My thoughts are inclining that way
    As I live in N Scotland , got to find a supplier to suit.
    Many thanks again.
    Yours Mechan6



Page 2 of 3 FirstFirst 123 LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Chester 20v and G0704 comparison

Chester 20v and G0704 comparison