You know how you start one project and it just seems to spawn multiple others.......
So as part of rebuilding the Biax scrapers I need a way of sharpening the carbide blades. When we did the scraping course Pete brought along a lovely little grinder he had made from a Rexon disc sander which he could mount abrasive discs too.
So the plan is too make something similar to that, and also along the lines of this one done by Build something cool.
I have a selection of motors one of which is a lovely little 90w 3 phase unit complete with inverter that was used for opening security barriers. Have removed the reduction gearbox and with the VFD running at 20Hz the spindle speed is about 300rpm which is perfect for the grinder so that gets me away from having to fiddle with pulley sizes etc.
Now the motor might not be man enough as its only 90w but it will be running at full torque and only spinning a 150mm disc so we will see.....
The big design question for me is whether to mount the disc straight onto the motor in an arrangement like this
As I don't need pulleys for gearing or speed control I could do this. My concern is the motor shaft is only 4.5mm so potentially I could be putting a lot of load on the shaft and the spindle mount.
The alternative is to use a layshaft? in pillow bearings run off drive belts like this.
Bit more complicated to set up and would need to source pillow bearings, pulleys and belt but takes a lot of load off the motor spindle and the pillow bearings would be much more able to support any axial load.
So, any thoughts from the collective on which way you'd go?
Also will need to turn the abrasive disc mounting plate down from some aluminium, so if anyone has any offcuts of ally maybe 10mm thick and big enough to turn a 150mm disc then give me a shout
Cheers,
MM
So as part of rebuilding the Biax scrapers I need a way of sharpening the carbide blades. When we did the scraping course Pete brought along a lovely little grinder he had made from a Rexon disc sander which he could mount abrasive discs too.
So the plan is too make something similar to that, and also along the lines of this one done by Build something cool.
I have a selection of motors one of which is a lovely little 90w 3 phase unit complete with inverter that was used for opening security barriers. Have removed the reduction gearbox and with the VFD running at 20Hz the spindle speed is about 300rpm which is perfect for the grinder so that gets me away from having to fiddle with pulley sizes etc.
Now the motor might not be man enough as its only 90w but it will be running at full torque and only spinning a 150mm disc so we will see.....
The big design question for me is whether to mount the disc straight onto the motor in an arrangement like this
As I don't need pulleys for gearing or speed control I could do this. My concern is the motor shaft is only 4.5mm so potentially I could be putting a lot of load on the shaft and the spindle mount.
The alternative is to use a layshaft? in pillow bearings run off drive belts like this.
Bit more complicated to set up and would need to source pillow bearings, pulleys and belt but takes a lot of load off the motor spindle and the pillow bearings would be much more able to support any axial load.
So, any thoughts from the collective on which way you'd go?
Also will need to turn the abrasive disc mounting plate down from some aluminium, so if anyone has any offcuts of ally maybe 10mm thick and big enough to turn a 150mm disc then give me a shout
Cheers,
MM
- hopefully the one from the gate opener should be more than man enough then. I need to build a frame to hold it all together so am thinking I may as well look at the layshaft approach anyway.
- I like how you've used the front plat to mount the motor and the backing plate
