Thread: Drag Knife anyone?
Watching the cardboard box video and notice that on every direction change it has to lift Z then plunge down again.
Is that necessary and if so it's a lot of messing programming these moves. I don't know anything about these but after seeing a vinyl cutter doing the signs for my new van it seemed to be a lot faster than this and continuous. Perhaps a search on the Zone is in order ?John S -
That's damn expensive!
Seen it done on plenty of sites, but thought I'd not need it, so didn't save them... Doh! Having said that the Tweakie pages have images of vinyl cutting - can't remeber if he details the design or not :-(
Tweakie.CNC - Vinyl Cutting
From what I remeber of other sites, they use a standard vinyl cutter blade (or sometimes Blade & holder) in a tube with ball bearings to allow it to pivot, the shape of the blade forms the castor. Should be no need to lift of, I pretty sure the vinyls cutters I've seen didn't
Yes I can see this but must be a pain to program as each entity has to be cut as an open line so it lifts off [ Z clearance ] at the end of each cut.
But if it does lift, then plunge down to do a cut at say 90 degrees to the first, how does the blade move round if it's just a swivel ?
Did a search on Ebay and you can get a simple tubular knife from the states with shipping for £115.
Cut Sign Vinyl - Drag Knife Bit for CNC Router End Mill | eBay
Marchant Dice sells the same item for £200John S -
Could it be cutting from the ends of each line to the middle?
The device itself isn't too complicated to make but its use may well be far more involved than we think.
I looked at the videos on Donek tools site again, the knife is still in contact when the machive changes direction, just with a very much reduced DOC, the castor on the blade still has to have some resisitance to operate. Has to be a pain to code!
An eBay search for "Roland Blade Holder" turns up plenty of vinyl cutter holders, not sure if these have the bearings in them, or if the bearings are in the part of the machine that holds them, for the money (£7ish upwards) though, they'd be worth a look at least as a basis for thin material.
Still trying to find the links I had for other drag knifes, I must learn to be more organised!
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