Thread: Thor, or should that be Zeus?
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10-01-2017 #191
Yep, at the moment the likelyhood will be either -
Just use a Chinese Spindle, I have the VFD already.
Get a BT30 Spindle, belt driven and use the same Chinese spindle to power it. This allows me some gearing options too.
Use the same BT30 Spindle and go AC Servo. Anything over 1.5KW needs to be 3 Phase and is fairly expensive. £1500 probably for a 4KW AC Servo and Drive.
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10-01-2017 #192
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10-01-2017 #193
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10-01-2017 #194
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11-01-2017 #195
One other thing not mentioned or consdiered is weight.?
The combined weight of Spindle cartridge, motor and all that concrete will most likely require some form of counter balance. Servo alone unless large KW won't be enough I think.
My big mill has got Int40 (Same as taper BT40 with slightly different holder) spindle with 5.5Kw Inverter Motor which spins at 7500rpm and the motor alone is too heavy for one man to safely handle. The pulley alone (which uses 2 x multi V belts not HTD.!!) must weigh same as 2.2Kw spindle.
Recently I removed the head unit from column and reckon it must weigh 500kg. There is 10" sqr 3ft long Solid steel block runs down the centre of column that counter balances it. The whole thing can be lifted up/down turning the ballscrew by hand.!!
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11-01-2017 #196
Thats a beast JAZZ, what sort of size rail does the head/bed run on??
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11-01-2017 #197
Certainly is That's the Full beast before took it from my friends place, just need to get it finished it's in lots of heavy pieces at minute. Been going to update thread I started so watch out you'll see it in pieces.!! . . . . Built like tank and weighs about same.!
The head and carriage run on 3" chromed box ways the bed runs on chromed Dove tails all fitted with piped lube system handled by controller so constant lube while moving.!! . . . Floats like butterfly stings like Bee-astard if get in it's way. . .Lol
1.8Kw Ac Servo's connected to 32mm 5m pitch C3 Ground ballscrews with 2:1 ratio with 5.5Kw Spindle spinning 6" face mill in back gear and don't stop for anything, be that clamps , vices, people or walls.!!! . . . . Scary Can't wait to get it chomping properly.
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11-01-2017 #198
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11-01-2017 #199
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11-01-2017 #200
Time and cost yes, but your head is going to be pretty heavy so i reckon it will be best building in some sort of counterbalance now, could be hard to add later. This is likely why bigger machines have a fixed head/column and moving X/Y bed - you cant slam the head around if there is half a ton of counterweight hanging off it ;)
Last edited by Davek0974; 11-01-2017 at 03:48 PM.
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