iGull
New member
I tried moebeast's latest needle holder and I'm still breaking needles. If I keep the rpm at 5000 or less then it's fine. As soon as I go above that though, the needle snaps. Has anyone tried designing something like this? View attachment 95435
LOL, creepy, did you see my 'I have a cunning plan' comment above
The 'cunning plan' uses a 'scotch yoke' arrangement like your pic - perhaps not quite as complex 'tho - it's in hand as I type
On your head, I'm assuming that you are using piano wire as the needle (/music wire USA) ? If not, then use it, otherwise regular steel 'wire' doesn't have sufficient tensile strength to withstand the harsh treatment we give it If you are, then try increasing the distance between the head and the top of the nozzle (to reduce the side deflection of the needle).
If that still doesn't help, reduce your horizontal feedrate - I use 1000mm/min and 4500 RPM on depron with no issues and I've put a pile of it through my machine in the past few days. Also ensure that the backing you are using is sufficiently soft.
And finally, you only need enough stroke length to cut through the material - and keep the nozzle as close to the material as possible - 1 to 2mm max (unless you are using something like my foot design in which case it's on the material).
Hope that helps.
Cheers
Neil