Gate / Bridgeport Interract / Project

[kingcreaky]

Subscribed to Mr Crispin, Lee... that loco seems pretty hardcore :D

Weekend, themed "chicken and egg". Could of done a far better job of the Z stepper bracket, if the machine was working...



but its done nevertheless, even if its just for now




As mentioned previously, the spindle has two mechanical systems to control spindle speed. The "vari-drive" pulley arrangement, and also a back-gear which halves the rev output from the selected speed range from the vari-belt system. As Im unwilling to spend a fortune on the variable drive pulley I need for the motor, I intend to drive the spindle with a single ratio, then rely on the VFD and back-gear for speed change.

In order to get adequate torque at the spindle head, I need to start off with too much power, that way if Ive reduced the revs with the vfd, there is still ample power by ratio.

I was kindly given a main spindle motor for the machine, Its a brand new 8hp siemens 4 pole, it runs at 380v in star, so, il only achieve 4hp at 240v, If I run this at 100hz Il get approx 3000rpm at the spindle, and if I gear that 3:4 my top spindle speed will be around 4000rpm

only problem is,said motor was dropped (hence its free) the rear casing is shattered, It is also foot mouted, I need it face mounted. Therefore, I intend to replace the broken rear face plate with the existing front plate, then re-make the front plate, building in a face-mount







so, spent fifty notes on a nice slab of ali




then armed with my new found qualifications after a 18months of channel updates from the likes of doubleboost and keith fenner, off I set




what could possibly go wrong? ...

er, the "brake" setting on the vfd could be a bit optimistic for that amount of momentum.... and you could sheer a gear in the lathe gearbox !!!

bugger!


stripped a cog...

so now need to fix the lathe. god knows how..... I figure if I get really oily and look like I know what Im doing, inspiration will hit me....So have that in bits everywhere




Busy week at work, and in wales next weekend, so sulking with beer tonight.

anybody tooled up to make gears?