[Crevice Reamer]

Syil might have the 5K RPM pulley available, or maybe Novakon. Also, the tach on your SX3 will not read the higher RPM from your new pulley unless you modify it.

CR.

[Ozcad]

Syil might have the 5K RPM pulley available, or maybe Novakon. Also, the tach on your SX3 will not read the higher RPM from your new pulley unless you modify it.

CR.

Thanks for that finding and modifiying the pulley should not be a prob as I'm a fitter/tuner /welder we even have a set of broaches at workbut the mod on the tach have you or could you point me to more info?

[MotoGems]

Syil might have the 5K RPM pulley available, or maybe Novakon. Also, the tach on your SX3 will not read the higher RPM from your new pulley unless you modify it.

CR.

I was thinking of doing a chart... i can get hold of a tacho gun thingo and say measure 100rpm increments... just write them down... stick a chart up on the wall... most of the time i will be doing engraving, so i'll probably run it top speed...

[Ozcad]

I was thinking of doing a chart... i can get hold of a tacho gun thingo and say measure 100rpm increments... just write them down... stick a chart up on the wall... most of the time i will be doing engraving, so i'll probably run it top speed...

I was talking to a elec tech that contracts to us (programming plc's on some of our machines)about modifying standard tacho he said it could be expensive He suggested mounting a sensor to count rev's of the spindle pulley, I need to get some more info off him but it should be easy
Here are pics of spindle upgrade,
http://www.cnczone.com/gallery/showg...&ppuser=161064

[MotoGems]

It's alive.... the machine is alive...

Going to order two belts tomorrow. One for the 48 tooth pulley, one for the 60 tooth pulley...

Got the pulleys keyed. $55 for both.. probable at a bit of a favour price (mates rates)... Getting a tray made up $88. So then i can make some sort of enclosure..

Computer is working, Mach 3... going to learn lazycam... Have autocad .. some form of autocad...
So a fair bit of learning with the Mach 3 and lazycam.... also lots of fixtures / jigs to make..

Hopefully at the end of the week i can post of the differences in speeds with the different pulleys.

[Ozcad]

It's alive.... the machine is alive...

Going to order two belts tomorrow. One for the 48 tooth pulley, one for the 60 tooth pulley...

Got the pulleys keyed. $55 for both.. probable at a bit of a favour price (mates rates)... Getting a tray made up $88. So then i can make some sort of enclosure..

Computer is working, Mach 3... going to learn lazycam... Have autocad .. some form of autocad...
So a fair bit of learning with the Mach 3 and lazycam.... also lots of fixtures / jigs to make..

Hopefully at the end of the week i can post of the differences in speeds with the different pulleys.

I machined and cut key in my 48 tooth pulley but I ordered the wrong length belt so if a 20mm wide htd 525 5m belt is any good to anyone let me know.
Refitted my quill with the new bearing set up, it now purrs like a kitten instead of growling like a tom cat I reckon it's half as noisy.
Top speed with a 48 should be 3840rpm if the motor runs @3600
Photos of bearing setup in my gallery

[extrapilot]

Guys
Yea, I would forget trying to mod the OEM board for the tach. It might not be a huge deal if the MCU code is unprotected (i.e. mod the opcode on the OEM processor), but would be a ton easier to just build or buy an external optical tacho. RC guys use them for tuning helos/fixed wing engines in the field- just an optical counter. They are like $25usd. All you would need to do is provide a couple of timing stripes on the collet holder or on the pulley itself 180deg apart, and hook one of these up. They are accurate to something like 10rpm.

This kind of thing is really easy to make with just a stupid LED/photodetector, and about 20 lines of code in a microcontroller, but add the cost of a display, battery holder, etc, not to mention your time, and the retail version looks a lot better

R