My Harrison M250 lathe
This is my M250 lathe
At the rear of the cross slide is a custom made rear toolpost i use for parting
At the front is an extension for extra cross slide travel
The X axis motor is mounted under the apron which i made, this keeps it clear of chips and coolant
The Z axis ballscrew is covered by a telescopic screw cover this is in place of the standard lead screw, the original mount was machined to accept the double AC bearings at the pulley end
I replaced the compound slide with a fixed steel block as angles are easy under CNC
The machine is shown being homed it uses optical switches which are accurate/repeatable to 0.0002" jogging and going to X zero via custom buttons on the screenset.
New additions on the screenset allow me to set much slower rapids to prove the program but allow the program to feed normally.
The motor and limit cabling are in separate flexible armoured conduit.
I made the enclosure from 6mm perspex to retain chips and coolant.
I use my own custom screen set for Mach3 which is also available for download from the Mach3 site but the latest version is not available yet.
I have changed the coolant arrangement to come down from the top as i am normally chasing the tool around with the coolant.
I use two large MPG's mounted on the front so i can sort of use it in a manual mode.
There is a custom switch panel behind the keyboard which was mounted where the original M250 switch panel was mounted.
This will be remade to fix on the front of the machine along with the MPG's where it will be more convenient it will also have more dedicated buttons to control it i use a PoKeys device for this the main control is run by a Smooth Stepper The bobs optical gear etc all comes from CNC4PC.
I use a new 2HP motor controlled under Mach3 by a VFD this gives me double the speed of the original but also allows for speed changes within Mach3. I also use the gearbox as nothing beats a mechanical gearbox for getting lots of slow speed torque/grunt.
I used a CNC converted FR31 and a series II Bridgeport to to the milling drilling the turning had to be planned in advance as it was done on the lathe, plus use of other machines.
I also did the narration (badly) as you will notice.:lol:
Phil
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