Page 2 of 3 FirstFirst 123 LastLast
  1. #11
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Current Activity: Viewing Has been a member for 9-10 years. Has a total post count of 1,837. Received thanks 192 times, giving thanks to others 5 times.
    Seeing that vid has just given me an answer to a problem I'm facing!
    I may now have to build a router frame...
    .
    You could make your own drag knife, although if you're wanting to cut thick card, a tangential knife setup would work better although is good bit more complex.

  2. #12
    Quote Originally Posted by Gtee87 View Post
    Thanks for this I am really starting to believe that I should go with a manual approach until I get some traction and cash to go for the full CNC machine . Only thing is how do I make the cutters and can this be done to cut right through cardboard ?
    In that case depending on the number of each type/card cutting you want to cut would stencils made out of alu plate say 5 mm thick be any good layed down over the card and a couple of hand tools knocked up..small rollers on the end with a blade that can be adjusted for depth of cut..

  3. #13
    What size parts do you want to cut?

    You might be able to do this with a second-hand CNC3040 and narrow endmills. Probably no help for production but could do some prototypes I imagine. A new CNC3040 could be had from eBay for ~650. I know they are not sturdy machines but for cardboard it could be easy and cheap.
    Last edited by Tenson; 22-02-2014 at 02:02 AM.

  4. #14
    I think that cardboard requires a drag knife,not a rotary cutter. I have log believed that a drag knife blade could be held in an unpowered spindle would work in a small cnc machine and did indeed intend to try this, but have never yet got around to trying it. My wife uses a a card cutting machine (craft robo) which works well for THIN card, sadly however the blade diameter is too small for my i/8" collet chuck. My intention had been to try to get one of my many (too many) broken 0.5mm cutters reground with an offset point, but the road ro hell is paved with good intentions!!! I still think it would work though. G.

  5. #15
    My wife uses a a card cutting machine (craft robo) which works well for THIN card, sadly however the blade diameter is too small for my i/8" collet chuck.
    Dremel and others make a very small 3 jaw chuck that might hold .5mm you might be able to hold the chuck in your collet with an adaptor. Just a thought. ..Clive

  6. #16
    Quote Originally Posted by m_c View Post
    You could make your own drag knife, although if you're wanting to cut thick card, a tangential knife setup would work better although is good bit more complex.
    M for drag knife to work as good as it does in the video the knife has to do litle U turns at each corner to orientate the blade. If you check out the site or do a search there is the Code which does this for you and alters the G-code file.

    They do work without it but no where near as good as it looks in the video. Tangential Knife is best option but defeats the Cheap requirement.!!

  7. #17
    Quote Originally Posted by Clive S View Post
    Dremel and others make a very small 3 jaw chuck that might hold .5mm you might be able to hold the chuck in your collet with an adaptor. Just a thought. ..Clive
    Thanks Clive. You have slightly mis-understood what I meant. I use PCB type end mill cutters which all have 1/8" shanks. The 0.5mm cutters have a very short length of cutting flutes so the broken ones leave quite a long length of 1/8" solid carbide shank to regrind as a dragknife with a decent offset to get the knife to follow. from what I read into the comment from Jazz, this may well work, but would benefit from using a modified G code. G.

  8. #18
    Quote Originally Posted by GEOFFREY View Post
    from what I read into the comment from Jazz, this may well work, but would benefit from using a modified G code. G.
    Yep Geoff if you watch the video carefully you can see the machine Jiggle at the corners doing very fine moves so the blade orientates to the direction to cut.
    It almost looks like Tangential knife because blade spins before moving in direction of cut but the rotation comes from the machine movements not the spindle and the blade is just held in an Offset holder which spins in bearings held in outer assmebly that's held in spindle collet.

    Without this extra code to orientate the blade it can tear or pull sharp corners.!!

  9. The Following User Says Thank You to JAZZCNC For This Useful Post:


  10. #19
    So does anyone use a stepper motor to hold the knife so that it can be turned using G code as if it were a 4th axis ?
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  11. #20
    Eddy, the blade is normally freely rotating and follows like a supermarket trolley castor. I think that Jazz is only referring to sharp turnsetc. for any code mods. G.

Page 2 of 3 FirstFirst 123 LastLast

Similar Threads

  1. RFQ: Can you quote my project?
    By Sparrow Legs in forum Projects, Jobs & Requests
    Replies: 3
    Last Post: 30-09-2013, 07:21 AM
  2. Replies: 4
    Last Post: 26-04-2013, 08:37 AM
  3. RFQ: Wondering if it's possible to get these CNCd and looking for a quote
    By steventhebrave in forum Projects, Jobs & Requests
    Replies: 7
    Last Post: 07-12-2010, 03:45 PM
  4. Does this quote seem reasonable?
    By HankMcSpank in forum General Discussion
    Replies: 31
    Last Post: 02-03-2010, 10:21 AM

Bookmarks

Posting Permissions

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