Wood Router

[Jonathan]

So the next question is would you remove more material by wasting away or would you keep the mass of the side plates ... both has benifits , but i guess a lighter ganrty is the way to go
L8r

Incorrect priorities.
A heavy gantry (and machine in general) is good since you want to have as much strength as possible. Making cutouts, including the ones you have already drawn, just wastes strength and money. Rigidity is far more important than feedrate. If you're reducing the mass to improve the feedrate you're going about it the wrong way - you should select the motors and drivers to get the feedrate you require which, as Jazz said, means buying 70-80V drivers such as the M752. Bear in mind the stepper motor output torque at high speed is roughly proportional to the applied voltage, so going from 45V to 75V is a 67% gain in torque where it matters.

[JAZZCNC]

Incorrect priorities.
A heavy gantry (and machine in general) is good since you want to have as much strength as possible. Making cutouts, including the ones you have already drawn, just wastes strength and money. Rigidity is far more important than feedrate. If you're reducing the mass to improve the feedrate you're going about it the wrong way - you should select the motors and drivers to get the feedrate you require which, as Jazz said, means buying 70-80V drivers such as the M752. Bear in mind the stepper motor output torque at high speed is roughly proportional to the applied voltage, so going from 45V to 75V is a 67% gain in torque where it matters.

Yep has Jonathan knows I agree with him 100% . . .Don't cut mass for speed. I'd do without the speed before ridgity every time.! To be honest Ridgity can make up for the lack of high feed by allowing deeper DOC.

Sell The G540 get the bigger drives you won't regret it and you'll be amazed what them motors can do on 70V.!!

I'm an X Axis is long Axis believer has well and anyone who says other wise is a numbnut . .Lol

[Buba b]

Yeh i agree with both of you but at the end of the day i need to get this machine working on the G540. Replacing the Gecko with the PM752 is the way to go for both machines but the cost is adding up for just the build of this hobby machine let alone replacing the drives. Had a quick look on the Evilbay and it would still look like an extra £280 ( not including steppers ) to get this setup .So im just going to have to run the Gecko at slow speed .... im in no rush , its a hobby until the cash surfaces.

The spend so far looks like this

Extrusion £250
Tool plate £180
Linear Rails £230
Bolts / fixings £52
Steppers £120
Cables £50 = £882 ..... ouch even i didnt think i had spent that much !....... and who said golf was expensive !

L8r ive got a kitchen to fix !

[JAZZCNC]

Sorry to sound negative but do you realise that using the G540 with those motors your not actually getting 3Nm holding torque.? The G540 is limited to 3.5A and those motors are 4.2A so you'll have a proportional loss of torque.!! . . basicly you'll only have 83% motors rated torque so the potential issues could be worse.!!

Not trying to put a downer on the build and fully understand the need to keep funds under control just want to high-light potential areas for disapointment when finished.
Unfortunatly I see far too much Miss-match motor-drive-PSU combo's and one of the things I hate when speaking to new users is telling them they have bought mis-matched stuff.

I say bo@#*cks to the kitchen sell the GF buy some big drives. .

[Buba b]

Well i knew everyone would jump on the G540 despite me say in the first post " thats the way it is ". It never mattered runing at reduced torque on the BF25 mill , you can only cut so fast on these bench mills before the lack of mass starts to show on the finish.
Just have to see if the bonus pays out at work too see if i can change the Gecko , shame Zap dont do a deal without those steppers as im set on CNC4you,s and Evilbay dont show much with the M752 either !.

I say bo@#*cks to the kitchen sell the GF buy some big drives

Sell the GF ..... hmmm ...... now your got something there ! , but when you consider that i did a 16 hour day yesterday and still had to make my own pack lunch at 11 o,clock for work as she played on Facebook .... i dont think il get enough for the drives

[JAZZCNC]

Ye I know did see that but still my OCD wouldn't let me NOT say it.!!!! . . . Plus your building what will be reasonably heavy gantry and wanting to cut wood so it will be whizzing around a bit and when you hit the brakes it won't have the gonads to stop without losing position.!!
Add to this the fact your going to 1:2 ratio to gain speed and lessen the torque of an already torque limited motor/drive it becomes even more important.!! . . . So it needed pointing out and my conscience wouldn't let me not. . . Doh Sorry.!!

IMO your wasting your time building strong and heavy duty fast machine if your going to run it on light weight drives missmatched to the motors.!!!! . . But I understand your stuck with them for time being.!

Sell the GF ..... hmmm ...... now your got something there ! , but when you consider that i did a 16 hour day yesterday and still had to make my own pack lunch at 11 o,clock for work as she played on Facebook .... i dont think il get enough for the drives

Hmmmm she's need to have the nature and temprement of Mother Tereasa be a Nymphomanic sex addict with the looks of super model to get away that and not be flogged.!!! (Flogged has in gone down the road not beaten to a pulp.)

[Lee Roberts]

and still had to make my own pack lunch at 11 o,clock for work as she played on Facebook .... i dont think il get enough for the drives

Eh, do you live in my house by any chance