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It's CNC Jim, but not as we know it...

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Joules:
Ahhhh, after years of procrastination and frustration I have finally got CNC for the little SU1 mill.

OK, OK  it's "Carefully Nudged Cutter" machining.  After years of making Delrin parts and using what ever router bits I could find as form tools, I was talked into this being a really good idea....  Cheers Rob, and as it turns out    :med:

I bought one of Eccentric Engineering Turnado full kits with the intention of fitting to my 12x36 lathe, but whilst machining the tool post block on the SU1, it struck me that this was what I wanted to CNC the SU1 for.   Profile work and ganged tooling, due to lots of issues it never happened and the SU1 was really needing to justify its place in the workshop.  I changed it over to permanent horizontal use a while back and for small stuff it has been good, this bit of kit has assured it's place in my workshop.  The Tornado kit isn't cheap, unless you factor in my years of wasted effort and time trying to figure out automating the SU1, in which case the Turnado is very cheap based on those hours wasted.  It operates like a little graver, you can move the tool holder around by hand, or use guide rails for rounded components, or the parallelagram arm to trace a profile.  Hmmm a laser cutter would be good for cutting profiles out of thin perspex, might need a bit of rubbing smooth, but easy to build up a collection of profiles and engrave what they are at the same time.   Cor...  You would have thought I planned this.

The examples below show the dome on a bar being hand turned, the geometry of the cutter doesn't allow it to be pulled into the work, and the load is very light so easy to control.   Some good magnifiers are a must for us Old Gits.

I only have a limited number of ER11 collets, so part of this brass rod needed turning, on the lathe, to fit.  The little ER11 chuck is great for small work and being able to change out for the ER32 makes for a large range of material sizes.

For larger work I can use the overarm on the mill and set up a live centre to support longer work.   I am writing a list of tools and accesories to make for the Turnado, the grid pattern plate offers lots of scope for adding stops for doing repeat parts.  Lets see where we are with it later in the year.   A big thanks to "Gary" at Eccentric Engineering for making a real quality tool, lots of attention to detail and well thought out.

Brass_Machine:
That's a nifty tool!

Eric

Joules:
The first of many Mad Mods....    I need to be able to tram my stock and the profile mount for reasonably accurate work, within ±0.02mm.  Now the arm does have some play in the joints, but once you load it up in one direction it stays accurate.  Not a great example here as the stock isn't great, or that long, but you get the idea.   3D printed arm puts the DTI ball at centre height and a piece of 1/4" stock is used to mount the arm in the tool post.  This print is out by about 3mm top to bottom, so revision 2 is printing now.

Joules:
First test with a template, 3D printed rather than laser cut as I still don't have any thin Perspex, and expect the laser to not leave a clean edge.  Bearing in mind this material had quite a bit of stick out, I turned the small end first and worked back.  My material wasn't long enough to clear the ER32 collet nut so a bit of juggling at the large end meant I had to reposition things and line them up best I could.  That resulted in the ring on the rear of the centre ball, and not able to clean the large ball.   Lesson learnt from this, you need a live centre and leave stubs each end to clean off after.  Even with the flexing the result isn't bad for an unsupported first try.   It was a lot of material to hog out in the first place.  I may try again, but remove the bulk on the lathe first that would also prepare the stubs for mounting at each end and they could allow the ER11 collet to be used, with much better clearance.   The 3D printed profile looks like it might work, the little notches in the template indicate the centre line.  The tool I used rubbed at the small end, so could do with a deeper grind to give more clearance.

slowcoach:
Looks brill that does. I bet there's not many people who turn on an horizontal mill :clap:

Rob :thumbup:

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