When i consider a force of a blow i typically use momentum in a deceleration form.
m = W*a/g
If my object has a volocity of 12 in/s. I consider my object decelertating in 1/20th of a second (almost instant depending on ur inpat).. so 12 * 20 = 240in/s^2
So if my load was 2000 lbs.. my...
Very good, im glad you agree zekeman. I thought this would be correct but i wasnt sure. Does anyone else understand this concept that we have agreed too?
Fox, havnt reviewed those documents yet but will at some point. I appreciate you posting them for me.
Ross, yes your assumption would be...
Thanks ross.. I agree a flange mount would be a total pain in the ass.. lol
Like the document that fox posted says how if the bearings arnt aligned the shaft can flex. I suppose thats why they dont recommend using it between bearings because it can flex.. not sure why as you said the torque arm...
Ohhh i see that... you have it written in a different form.. i would find my output torque of my motor then divide by the radius of the pitch diameter to find my lifint force.. its the same concept
so thats my output load how does that correlate with my sprocket? your saying the sproket will...
Yes fox.. However i think by the driving of the shaft there is some additional force being applied when its driven along with the 60lb load you pulled up.. would there be a reaction on the shaft whent he motor drives its 800 in/lbs of torque into the shaft?
I will spend sometime examining the...
Zeke, i will post the information SEW sent me on their mounting tomorrow.. it might give you a better idea of what it is.
Its bolted too the side of the reducer with 4 bolts. Its hard mounted to the gearbox and the arm extends out from center to center 4.33". It has rubber inside the end of it...
Has anyone found information on roller chain sprocket strengths? I look in my browning book and it has a list of HP ratings per revolutions per min. However this information seems a little skewed. On a 60p chain it says at 50 RPMs i need a 45T sprocket to put 3 hp into it. Is that right? Anyone...
Thanks for your post Ross, Yes its a 3/4" shaft which is small.. Right now my rep says the W box's are having longer lead times (here in america maybe? or just here in missouri) of like 12 weeks.. So i had to design in a S box for that reason. The W box's are pretty nice for the cost.
Well, the...
I didnt get to talk to my SEW rep however he sent me a PDF of mounting material.. i didnt get to look at it but he said they dont recommend driving a shaft between bearings.. i will find out exactly why tomorrow.
Yes its a very small box.. its only about 5 inches in height and the arm is 4.33...
It is actually 4.33" (110mm)
Yes the shaft will take up the torque on the shaft too.. (800in/lbs) but that is thru rotation. I was trying to determine linear deflection on the shaft since it is supporting the motor as fox says.
I will investigate with my SEW rep and see what he thinks.
Still...
SEW is crazy with their numbers.. DR is the new energy efficent motors they just started supplying. Any motor less then 1 HP is called a DRS and anything 1 and above is DRE.. its wierd
Not sure about the manuals but i could discuss it with my SEW supplier and have his take. If not he would...
SEW #SA37TDRS71S4; 1/2 HP; 3/4" HOLLOW SHAFT; TORQUE ARM; 51.30:1 RATIO; 33 RPM; M1 MOUNT; T BOX 0 R; CB@0
1/2 = 16lb * 51.30 *.9 (eff) = 738.7 true in/lb torque
That is the spec on the motor being used.
Carrying 100 lb pallet and 14 lb of chain on a 17T 60p sprocket @ 60fpm. Roller chain on...
We only refrenced it to for the style of their torque arms. Using a fixed bolt on the end. They have a rubber bushing inside for misalignment/shock load. The motor is as close to the bearing as we could get it based off the frame that this carrage pops down into. Its about 5 inches away from the...
Here is how the problem presented itself.
We used to use Leeson motors and reducers. We are moving to a more positive and better solution with SEW Gearmotors. This box in a hollow shaft mount does not have mounting holes on it, anywhere. On the initial design there was a channel that ran across...
