Servo Driven 4th Axis for CNC Mill

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awemawson:
:ddb: :ddb: :ddb: Well I'm pleased to say it works :ddb: :ddb: :ddb:

I've re-assembled the air actuator rack and cylinder, and am operating it blowing air from an air duster in the appropriate port for 'brake' or 'release'

awemawson:
There is a solenoid valve that fits on the end of the cylinder that diverts the two ports so one releases when the other operates (otherwise the inactive side of the cylinder would be blocked shut). I've not mounted it yet as it's coils seems to be 110 V and I need to operate on 24 V . I will probably re-wind the coil - it's all a bit of a mess currently :

awemawson:
So with a few ups and downs at least this phase of the build has had a happy ending :thumbup:

. . .lots more to do yet on this project. Probably the motor mount is next on the list

Andrew

awemawson:
A bit of playing around with CAD and some careful measurements showed that it was just possible to make a flange to convert from the end fixing SEM servo motor to the flange mount with external screws needed to be able to adjust the 4:1 gear train mesh for minimum back lash. The original stepper motor relied on oversized holes to get some movement, but as I was CNC'ing the flange I opted to give the hole a slot form with a 2 mm 'travel'

So first we have a CAD drawing and a 20 foot long bar of 100 mm x 20 mm bar stock

awemawson:
Now in an ideal world that flange would have been 110 mm square, but you use what you have :lol:

So all we need do is slice a 100 mm chunk off in the Pedrazzoli cold cut off saw, and remove the bits we don't want - how hard can it be :ddb:

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