528,148 active members*
3,110 visitors online*
Register for free
Login
IndustryArena Forum > WoodWorking Machines > DIY CNC Router Table Machines > What did I buy? Old machine, new tech, take a look.
Results 1 to 8 of 8
  1. #1

    What did I buy? Old machine, new tech, take a look.

    Hi all, I'm the new guy I guess. Hoping someone with some experience can give me info about this design. I'd like to find other discussions or documentation about it, if anyone can point me in the right direction. Would be cool to know the origins of the design or possibly the person who built the machine.

    I am going to read up on the controller, but it looks like its using a parallel port interface. My assuption is I need a windows 32 bit computer to run it?

    It's an older, used, diy machine. It seems to be of reasonable quality for the price. The machine hasn't ran in awhile and will need a bit of set up. Any advise you would like to give me is much appreciated.

    Machine Specs (mostly unkown)
    3" extrusion table, cutting area: 53" x 110"
    Gear rack: unknown
    Pinion tensioner: unkown
    Z-axis screw, rails and carriage: unkown
    Router: Porter Cable 7518
    Main Board: Practical CNC Rev 2.13
    Controller: PMDX - 126
    Drivers: unkown
    Motors: Z-AXIS: P22NRXB-LDF-NS-00 M Series POWERMAX II Hybrid Step Motor manufactured by Pacific Scientific 214 oz in
    X-AXIS and Y-AXIS*: M22NRXB-LDN-NS-00 M Series POWERMAX II Hybrid Step Motor manufactured by Pacific Scientific 253 oz in
    *Y-AXIS is ran with a single motor and long drive shaft.
    Sensors: none
    E-Stop: none

    I paid $2000 usd. Does that seem like a reasonable deal? I'm after a reliable machine that can cut wood panels for prototype furniture. I know its won’t be the fastest machine in the world, but hoping for decent productivity. Are there any obvious weaknesses or upgrades this machine needs?

    For reference I owned an xcarve and did a bit of playing around with the machine, but it caught fire and was a total loss before I was able to do much with it. Thanks to everyone or anyone who can help me get a better understanding of all this.
    Attached Thumbnails Attached Thumbnails BDF9545B-335A-4C72-ACA6-3A844397FB30.jpg   1E6A1F51-EE0F-4445-81E5-8BA3780EF5AD.jpg   6430C2C3-B6EF-46D0-9879-E5EDA5982606.jpg   F097EE7E-F27A-4B9A-8BC3-592CBDF20BE3.jpg  

    86ED06E7-C6E1-47AE-B94D-060124BB21B4.jpg   1D700153-4DCF-4609-BE2C-CE5A234F1EB7.jpg   FC66A8A5-A48B-4400-AA4D-8461D089E9B7.jpg   EAEC22E7-4F62-4800-8791-979A6C0DCBA9.jpg  


  2. #2
    Registered
    Join Date
    Feb 2008
    Posts
    623

    Re: What did I buy? Old machine, new tech, take a look.

    That may have been parallel port interfaced originally but it has been upgraded with a Ethernet
    Smoothstepper (the piggy-back board on top of he PMDX-126) so AFAIK it should work with modern
    64 bit Windows

  3. #3
    Registered
    Join Date
    Dec 2003
    Posts
    692

    Re: What did I buy? Old machine, new tech, take a look.

    What control software does the machine run and do you have a post processor that will work with it?From a mechanical point of view it has a diagonal brace across the end,is there an equivalent along the sides?When you describe the single motor on the Y axis,which is the Y axis?If I were looking for a weakness it would be that the machine seems to use bearings without much separation that run on rectangular steel rails.
    It could be a very useful machine but really needs sensors for home position and an E-stop might be the thing that allows you to stop it before this machine catches fire.

  4. #4

    Re: What did I buy? Old machine, new tech, take a look.

    Awesome! Thanks for your feedback.

    I'll try to plug it into my desktop. AND TRY NOT TO CATCH IT ON FIRE. I don't need another one of those... Definitely plan to add the homing sensors, limit switches and an e-stop or two.

    The controller works with Mach4, which I need to buy a license for. I can model okay in fusion 360 and have played a little bit with posting from it.

    I'm referring to the long side as the y axis, but I guess I don't know how it's wired.

    @routalot in terms of the carriage rolling on bearings riding the extrusions, is this design inherently troublesome, or something that can be made better with a wider bearing spread? How nice of an upgrade would it be to mount up some linear rails and some chunky ball bearing carriages?

  5. #5
    Registered
    Join Date
    Dec 2003
    Posts
    692

    Re: What did I buy? Old machine, new tech, take a look.

    I'd think the best thing would be to get the machine working and see what it-and you-are capable of.The bearings you have will work as far as moving the machine is concerned but the more use they have and the more wear that results,the more play will develop to the detriment of accuracy.If that reaches a level that you find unacceptable then linear rails would be a big improvement or if that seems like too much expense for the machine a 20mm round supported rail with good carriage separation might be an intermediate step.

  6. #6

    Re: What did I buy? Old machine, new tech, take a look.

    Thanks, I've wondered what the realistic difference is between the 20mm round rails and the linear rails.

    You're right, I just need to get it going as it for now.

    I reached out to CandCNC, they're awesome and hopefully I'll use their motor/driver upgrade one day. The rep Tom who replied to me said the mechanical weak spot of the machine is the thin driveshaft used to drive the non-drive side of the long axis.

    I've learned a lot about the controls since my first post. The pwnx-126 is just the breakout board and it has the needed Ethernet Smooth Stepper controller already installed. Those should do fine for my skills and this machine for now. Seems simple enough to connect limit and homing switches and an e-stop. Is there a best place to find switches? I like the idea of using proxity sensors, the avid cnc kit looks great but seems over priced for what it is. Can someone provide a recommendation for a good value option? Thank you!!!

    https://www.cncrouterparts.com/peppe...kit-p-293.html

  7. #7
    Registered
    Join Date
    Dec 2003
    Posts
    692

    Re: What did I buy? Old machine, new tech, take a look.

    There is a thread on proximity switches here: https://www.cnczone.com/forums/diy-c...me-sensor.html .

    They don't have to cost a huge amount and are quite easily found. https://ukcnc.net/index.php?route=pr...&product_id=92

  8. #8

    Re: What did I buy? Old machine, new tech, take a look.

    Quote Originally Posted by routalot View Post
    There is a thread on proximity switches here: https://www.cnczone.com/forums/diy-c...me-sensor.html .

    They don't have to cost a huge amount and are quite easily found. https://ukcnc.net/index.php?route=pr...&product_id=92
    Thanks very much for your replies and dropping the links! It's poor etiquette not to do the search myself, but it's easier to just have you to do it for me :joke:

Similar Threads

  1. Need a low tech solution to a high tech problem (kind of urgent)
    By PeliTac in forum Want To Buy...Need help!
    Replies: 2
    Last Post: 01-23-2014, 05:05 PM
  2. Hybrid? Older cam tech machine needs control retrofit
    By E2l2 in forum DIY CNC Router Table Machines
    Replies: 0
    Last Post: 01-12-2012, 12:00 AM
  3. Top Tech CNC Milling Machine from penn tool
    By wisp in forum Knee Vertical Mills
    Replies: 8
    Last Post: 03-29-2011, 12:43 AM
  4. Houston Area Machine Tool Tech Needed
    By cnctexas in forum Employment Opportunity
    Replies: 0
    Last Post: 01-17-2011, 06:33 PM
  5. CNC mill or RP machine for tech classes?
    By srmaietta in forum Teachers Hangout
    Replies: 8
    Last Post: 01-27-2009, 09:17 PM

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
  •