4 axis foam cutter configuration

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6 months 1 week ago #345868 by Retrofit
  Hello to everybody
I use to retofit mill and lathe with linuxcnc , all of them with probe basic.
All of them are working  , i do this for hobby.
Now  i build a hot wire foam cutting machine , a large one , 3m*1,7*1,7 m ,(for 1,2*1,2 section cutting) 4 independent axis
It is configurated with 7i92+7i76 board (old type both of them , remain from other project ) , including the mechanics , remain from projects  , linuxcnc , axis - foam configuration.
On desktop looks like work.
I need an advice , a configuration , an ideea how to manage the wire change of lenght , with a stepper motor , not mechanicaly with spring , pneumatic cylinder , or weight on both sides.
Something like a 5th axis.
I tryed with double y and v axis (vertical axes) ,  mirror axes like routers , XYYUVV  , the mirror axes move and rotate a whell and 'recover' the lenght of the wire , but in my opinion is a better solution , I think with only one motor that can compensate and manage the lenght change.
Thanx in advance
Denis

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6 months 1 week ago #345899 by stirra
I ended up using a bottle of water as a weight, with the wire fixed at one end and a pulley arrangement for the moving end. I used polished wire nozzles used for wire winding machines to guide the wire without fatiguing it. Do not try to use MIG welder wire nozzles, as they will break the wire very quickly.  I built the machine for a university lab, but I don't think they have used it very much since, so long term reliability is untested.-- Ralph
The following user(s) said Thank You: COFHAL

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