510,124 active members
3,261 visitors online
Register for free
Login
Results 1 to 11 of 11
  1. #1
    Registered
    Join Date
    Sep 2016
    Posts
    2

    Multicam Digital Express

    Hi Guys,

    I have a small shop and we only cutting graphic.
    Any one have a problem with machine jerkin, shuddering when it making small circle / eclipse or even a curve?
    Been addressing this problem to tech but they keep saying it's on the file.
    I'm using enroute for this digi express and we clean up countour 0.03 everytime we encounter circle or small eclipse.
    File i'm getting is dxf file.

    Any1 have encounter this kinda problem and have resolution to it ?
    Sometime when we want to cut a perfect circle it just never happen.

    Thanks in advance for any input or opinion

  2. #2
    Registered
    Join Date
    Jun 2010
    Posts
    415

    Re: Multicam Digital Express

    Have you ran a older program that you know works to see if this shows up also?

  3. #3
    Registered
    Join Date
    Sep 2016
    Posts
    2

    Re: Multicam Digital Express

    Hi MP,

    No we always ran this multicam with enroute.
    I just notice it maybe the machine can't handle the segment regarding accel and deaccellerate every segment so machine make a sudden stop and moving at the same time.
    It will make that jerking problem. Never a smooth curves.

  4. #4
    Registered
    Join Date
    Jan 2008
    Posts
    33

    Re: Multicam Digital Express

    nice to see some activity here

    it's my guess you're dxf contains lotssss of small line segments to make a curve, instead of curves made out of arcs
    the multicam controller doesn't like this at all

    can you have a look at you're g-code, maybe post a sample here
    when you open you're gocde in jobpreviewer you can have a look at the info to tell whether there are (many) arcs involved

  5. #5
    Registered
    Join Date
    Nov 2013
    Posts
    147

    Re: Multicam Digital Express

    Hi
    Yes have the same problem!! I have three Multicams 1 MG & 2 5000 s and the newest one ( About a year old ) does it too. I have the CNCworld tech guys looking at the problem and speaking to Multicam U.S. The best they`ve come up with so far is to increase the chord tolerance , which I`ve done. It`s better but still not great. I use Alphacam to create my programmes and the guys there don`t quite have a grasp on the problem so it`s still ongoing. Also muticams don`t like helical interpolations either , a disc cut in alliuminium will have the look of a worn sprocket. I do a lot of tool making and surface machining is a bit of a problem. Even running in fresh air the whole thing judders regardless of feed rate. It`s better in some directions than others and dependant on the size of arc being cut. I made a demo programme using polyline & spline arcs of various sizes in XYZ and the transit through the arc is terrible. Muticam say that the problem is in the way Alphacam outputs the code . An arc being made up of a lot of small straight lines and that it`s the acceleration and deceleration through these points that Multicam doesn`t deal with very well. If they come up with a solution I`ll post the results.

    The best I can offer at the moment as a partial cure is to slow your federate down to a crawl for small holes and if your cad package allows use a helical down feed. It`s not perfect but it will stop your machine from shaking itself to bits !!

  6. #6
    Registered
    Join Date
    Jan 2008
    Posts
    33

    Re: Multicam Digital Express

    the multicam control doesn't support a gcode for "Path Control Mode" (or has it been added later, can't find it on the web)
    on other controls G64 is used to set a compromise for speed <-> accuracy

    so you need to tweak the parameters in you're control using MotionMechanic
    before you do anything make a copy

    from machine -> file : shift + F2
    ( from file -> machine : F3 )

    these are the params of interest :

    Arc Speed Factor 193 F 4
    Arc Work Radius 194 F 25
    Arc Minimum Velocity 195 F 12
    F means float
    the value after F is my current value which is good for me in most cases

    on the command line of MotionMechanic :
    193 get_float f.
    will show current value
    5 193 set_float
    will set param 193 to 5

    there used to be a lot of info on multicam.com
    and a forum, not any more though . . .

  7. #7
    Registered
    Join Date
    Jan 2008
    Posts
    33

    Re: Multicam Digital Express

    dear FSdigitalla,

    I don't mind spending some time on typing, would be nice to know though wether you've made any progress on this

    thanks !

  8. #8
    Registered
    Join Date
    Mar 2010
    Posts
    274

    Re: Multicam Digital Express

    Quote Originally Posted by keesfrees View Post
    dear FSdigitalla,

    I don't mind spending some time on typing, would be nice to know though wether you've made any progress on this

    thanks !
    I've tried for years to find out what the parameters do. Where did you find that?
    My main machine: Multicam MG series (MG101) with original Extratech H971 controller, Minarik servo motors, Electro-Craft BRU-series drives, 4KW Colombo. Let's talk Multicam!

  9. #9
    Member
    Join Date
    Nov 2019
    Posts
    3

    Re: Multicam Digital Express

    Hello, I have a multicam, stopped working, reinstalled suite 4 and after loading the machine .xmi file, shows the following message on controller (1). Would you help me? Is the procedure just loading the .xmi file or should I do another procedure?

    (1) Please Wait ...
    Loading
    Version 8. 19

    But it never finishes loading.
    Please.
    Attached Thumbnails Attached Thumbnails WhatsApp Image 2019-11-29 at 12.01.33.jpg  

  10. #10
    Registered
    Join Date
    Aug 2011
    Posts
    59

    Re: Multicam Digital Express

    Quote Originally Posted by Boltz View Post
    I've tried for years to find out what the parameters do. Where did you find that?
    This should help you Boltz:
    https://docdro.id/MMtOgbc
    https://docdro.id/T27MRZ6
    https://docdro.id/VRJGnWc

  11. #11
    Member
    Join Date
    Nov 2019
    Posts
    3
    Thank you!!!

Similar Threads

  1. Express PCB
    By kevin200 in forum General Off Topic Discussions
    Replies: 3
    Last Post: 03-11-2015, 02:50 PM
  2. CNC Express SQ
    By NH3.R717 in forum Uncategorised MetalWorking Machines
    Replies: 12
    Last Post: 10-08-2014, 03:52 AM
  3. Digital Version of Digital Machinist
    By castiron43 in forum Digital Machinist
    Replies: 35
    Last Post: 08-02-2013, 12:04 PM
  4. v21 express
    By fernwood in forum BobCad-Cam
    Replies: 0
    Last Post: 01-12-2013, 10:41 PM
  5. NX CAM express
    By j-miller.6 in forum SolidEdge
    Replies: 0
    Last Post: 01-27-2008, 10:09 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
  •