Sunday, November 8, 2015

CNC Plasma Project Update 2

Saturday, turned into yet another game of "planes trains and automobiles" (named after that comedy movie)

I didn't get anything made on the lathe as I had to buy stuff and the operator was having a hard time getting the boring bar to make the right size of roller.

Basically the part has to have a 17mm hole inside it and the bearing has to press inside tight without needing glue.

This is a boring bar used to make holes.  

They tried a 17mm drill bit on it but their bit left the hole too loose and the brand new bit I bought did the same.

So my solution in the interest of speeding up things was to grind down the drill bit.

This is not a operation done entirely by hand.  Rather the bit is out into a holder with a crank that turns it.  This is attached to the bed of a surface grinder and the machine is manipulated to grind the item.

This same method is how very tough metal pins are made.  Metals that either can not be cut with cutters, or are too delicate, can be ground in this manner.

I used a tapered bit like the one above because the chuck is too small and this type of bit fits into the tail stock without a chuck.  

Sunday, I spent the day working on the CNC plasma cutter electronics.

I must be getting good, cause I had it working first try.

This one the board on.ine is $70, local 24v power supply is $35, motor driver $20 and motor is $70

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