I don't need Lee to fight my non existent battles, all big boys here. I get on well with Jazz, it's all taking the piss in good fun.
Just some don't have a sense of humour..................................
I'd feel happier with this red pen application if he reigned his so called moderators in a bit better.John S -
velocity = 10m/min = 10/60= 0.167 m/s (not actually required for the initial calculation)
mass = 80kg
It's just newtons 2nd law, so F=ma=80*1=80 Newtons (equivalent to lifting about 8.2kg), so not far off my earlier estimate.
From the motor's point of view it's not 80N, since we have to consider the ballscrew in between. The ballscrew gives the motors a huge mechanical advantage. The relevant formula, which can be derived from considering the ballscrew as a ramp, is:
Where T is the torque, F is the force applied to the nut, p is the ballscrew pitch (so 10mm=0.01m) and e is the efficiency (about 0.9). So chuck the numers in:
So changing direction at 10m/min and 1m/s, as you describe, only translates to an extra 0.14Nm torque on the ballscrew, compared to going at a constant speed and 80N force on the ballnut.
The Following User Says Thank You to Jonathan For This Useful Post:
Thanks for that.
Does that calculation include counteracting the inertia from the screw turning too? I forgot to mention that. I'm interested to see what the total load would be.
Originally Posted by Lee Roberts
There's no Red Pen, No one has done anything wrong (as such), im not tapping the badge or picking on anyone. My kids are having a sleep over with their cousins the age range is 3 - 10 so you can imagine what i'm up against, as such im up and down from my laptop like a yoyo, if i'd of had more opportunity i was getting ready to type up a PM to you and Jazz just to let you know why i had removed the comments and there was no "hard feelings" to keep it simple.
I've kept this short and sweet so i can get it in before it all gets blown out of context and people start chipping in, Merry Christmas John its good to see you active again.
So on this matter request you meet me Sir in the Central reservation of the M1 for a dual at dawn. (Or when ya eventual fire the zimmer up.!!)
Bring the Axle grease because the loser gets Rm2005 inserted side ways and Z axis up his Pi$$~£.!! . . . . Now F@~% O%% You Old B%@~% and happy Xmas mate. . X X X
X X X X X X X X X X X X X X X X X X
Now I've got a important and just has relevant Calculation for Jonathan.?
Was in workshop Tuther day and waiting for Job to finish when I felt another Jobbie coming on and while there Nipping the Old vice Cheeks started to wonder just how many Nm of force could be applied thru Cheek power alone.? . . . . Obviously realise this will be a rising rate has desperation sets in so some parameters will be needed..?
So lets say when at the Turtle point of 15st Fat B@~&$ erds thrust curve when powered by a full Vidaloo madras.?
Oh and what will be the stall point time curve so know how many liner meters of paper for Clean up.?
If we are talking about the central reservation on the M1 than lets use the bit just below J27, the Mansfield turn.
Rather partial to that bit after having removed about 30 metres of it in a wrecker one day doing a slow spiral from slow lane to central reservation.
So after all the "Pi$$~£.!! . . . . Now F@~% O%% You Old B%@~% and happy Xmas mate. . X X X
X X X X X X X X X X X X X X X X X X"
Are you having them ?John S -
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