Request for two small steel rod-esque lathed part!

[HankMcSpank]

Over the weekend I had a bit of a play with my homemade CNC - I made a lot of simple mistakes, like forgetting to zero the tool after a tool change, only to watch the drill bit plunge right down through my material & a little into the table- eeek!), here's what I've been on with (rather than six little coils - one per string - becuase I don't have those parts I need, I had a opo at a larger coil.....



(I'm not sure if you'll notice, the bit marked 'bottom' part has a slight chip at the top left corner, this is because when changed cutting bits ,I had the feed rate too high, the machine went ballistic & gouged into the part a little! But since this is just a protoype, I couldn't be bothered to re-run the cut! The other two parts turned out well though...particularly happy with that middle bit - that's just 1mm between the edge holes & the bobbin edge at each end - remember my leadscrews are just M8 rod, & my drive nuts are badly homemade delrin ones!

The colour scheme(!) wouldn't be of my choosing, but I was limited to those colours because of the thickness of the acrylic (I needed 2mm thickness which I only had as clear acrylic & also 4.5mm which I only had in translucent royal blue!). Here it is as a temporary 'push fit'



those poles sticking up are actually 20mm lengths of Alnico magnets ...they obviously need trimming...they were an *extremely* tight fit. I screwed up with the middle part too! Basically, I read somewhere to get rid of the cutter marks that acrylic can be flame polished along the edge ...apparently, all you need to do is run a butane torch gas flame along the edge - I'm sure it normally works well, but not when the part so small....the acrylic heated the small part up & distorted the acrylic! (shrunk it a fraction...hence a couple of the poles not being bolt upright)

Here it is ready to be wound (I've not glued the top to the middle, because, after the coil is potted, I'd like to see how it looks without the top, hence the large washers clamping the top to the middle for while it's being wound)...



(the square edging makes it look somewhat utlitarian & of "East European circa 1970!" design ...but it's just a prototype so I have expended much effort giving it bevelled/rounded edges!

So then, next I wound 150 turns of 0.235mm wire (which is actually 0.27mm if you include the enamel coating!), this gauge is much thicker than I'm used to & is quite a bugger to 'control' while winding on to the bobbin....

....those two large screws atop are simply holding the top part to the remainder (pending potting - after which, the screws will come out & the magnets will go in)