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Here's my extruder block. The addition of a usable bandsaw has helped immensely, and the pedestal drill is significantly tighter, although still can't drill a straight hole. As you can see, this piece is a fair bit neater than my others. I have tried it with my splined motor (no pics yet though), and it works fairly well on some copper cored wire. I haven't made the large cut-out for the thermal break yet as I haven't actually decided whether or not I'm going to make my melt barrel that way.
Originally, the bearing was too far over by about half a mm, so I enlarged the hole a little bit and put in a matchstick to hold it in the proper place.
I have read the A4983 datasheet with an eye to current capacity, and I will have to heatsink them. The current pot and Vbb capacitor on the pololu breakout boards are taller than the chip, so that will make it a fun exercise. I think I will leave the pot sticking out the side, and either put a copper strap over the chips or cut a recess for the Vbb capacitor. A 40mm chipset heatsink has made itself available for this project.
Well done I'm making the ext ruder block for my Mendel version out of Acrylic block as its easier to see what your doing in 3D.
ReplyDeleteI have already made one for the Darwin ext ruder out of Acrylic block not sure if I blogged that one yet. Interested in you mentioning the A4983 as I have those and A4980 devices I got tiny little stick on heat sinks from Farnell over a year ago with the idea of using them on the A4980 devices.
Just soldering the chips on will be a fun exercise as the pin pitch is half that of the A4982 devices I tried to find the larger package but no where had them.
I got a chest infection so not done much this week aside from making Stepper controllers, ribbon cable and re-working the 1.1 motherboard and 1.2 Ext ruder controller (Removing the Ethernet connectors and AT power connector..Didn'T read the Extra notes on modifying these boards for Mendel till Tuesday.