28ten
Guv'nor
This is a bit rough and ready, so please ask any questions :laugh:
the C3 is more than accurate if you take suitable precautions and have it set up properly. Things to not: a saddle lock is essential for facing and using the form tool. in the last picture you can see the Dial indicator I use to measure the cross slide travel - much more accurate for measuring the facing operation. FWIW i never trust the the leadscrew measurements and I always use a dial indicator where possible. (Arc euro do a 2 inch model for about ?25)
although not shown here a set of colletts is another essential - you can pick up a set for about ?35 from the right place
After facing the rear of the wheel in the soft jaws .the wheel is mounted in a mandrel with a Slaters axle fitted to in the center,
[attachment=2:1c2pk5n2]IMG_2836.JPG[/attachment:1c2pk5n2]
this needs to be secure so I reamed the hole to a precise fit and secured the axle with loctite 601 and left it overnight. It is also essential to use a live center and a clamping disc to support the wheel, force the tread against the mandrel and prevent the wheel from turning on the plastic center. Dont forget to make this before the mandrel as you dont want to remove the mandrel once the axle is fitted otherwise it will need to be reset with a dti to ensure concentricity.[attachment=1:1c2pk5n2]IMG_2853.JPG[/attachment:1c2pk5n2]
It is then simply a matter of fitting a wheel to the squared axle placing the clamp over the boss and tightening the live center, make sure everything is secure and sufficient pressure is being exerted. when you are happy blue the tread and reprofiling can begin.
I use 140-180 rpm and light cuts. Keep the tool and tread clear of swarf as it can cause chatter and jam the tool. Listen to the sound of the tool and you will hear any binding which precedes the tool diging into the workpiece. I aim to just skim the blue off the tread, and once you reach this state the tread can be deburred and removed from the mandrel. The next stage is to face and polish the wheels. and job done
[attachment=0:1c2pk5n2]IMG_2880.JPG[/attachment:1c2pk5n2]
the C3 is more than accurate if you take suitable precautions and have it set up properly. Things to not: a saddle lock is essential for facing and using the form tool. in the last picture you can see the Dial indicator I use to measure the cross slide travel - much more accurate for measuring the facing operation. FWIW i never trust the the leadscrew measurements and I always use a dial indicator where possible. (Arc euro do a 2 inch model for about ?25)
although not shown here a set of colletts is another essential - you can pick up a set for about ?35 from the right place
After facing the rear of the wheel in the soft jaws .the wheel is mounted in a mandrel with a Slaters axle fitted to in the center,
[attachment=2:1c2pk5n2]IMG_2836.JPG[/attachment:1c2pk5n2]
this needs to be secure so I reamed the hole to a precise fit and secured the axle with loctite 601 and left it overnight. It is also essential to use a live center and a clamping disc to support the wheel, force the tread against the mandrel and prevent the wheel from turning on the plastic center. Dont forget to make this before the mandrel as you dont want to remove the mandrel once the axle is fitted otherwise it will need to be reset with a dti to ensure concentricity.[attachment=1:1c2pk5n2]IMG_2853.JPG[/attachment:1c2pk5n2]
It is then simply a matter of fitting a wheel to the squared axle placing the clamp over the boss and tightening the live center, make sure everything is secure and sufficient pressure is being exerted. when you are happy blue the tread and reprofiling can begin.
I use 140-180 rpm and light cuts. Keep the tool and tread clear of swarf as it can cause chatter and jam the tool. Listen to the sound of the tool and you will hear any binding which precedes the tool diging into the workpiece. I aim to just skim the blue off the tread, and once you reach this state the tread can be deburred and removed from the mandrel. The next stage is to face and polish the wheels. and job done
[attachment=0:1c2pk5n2]IMG_2880.JPG[/attachment:1c2pk5n2]
