This is my current design. I input raw data, and it outputs STDEV.S() calculations on the right hand side.
Raw Data
1
1
1
1
1
2
2
2
3
3
Standard Deviation 1.700619082
# of 1's: 5
# of 2's: 3
# of 3's: 2
My thoughts so far is that I want to...
Hello All,
Take a look at the attachment. I have hundreds of these pillars that will be positioned and adjusted using studs with leveling nuts.
I need the red face of the pillars to all lay in the same plane as one another within 1/32" of an inch. (We usually do this by just projecting out a...
More info:
It's a dual car lift with a canopy that holds a second vehicle.
Lift is rated for 12,000lb live load and has dead load of 7,500lb. Lift stroke is 90" (7.5ft).
I found a 1phase input VFD that was rated for 7.5hp. And I'm now looking at a system similar to a log-splitter with two...
Thanks for the feedback!
It's not my lift. (Wish I had this problem).
It's a high end residence and we've done these before with 12hp HPUs when there's three phase power, but I'm in this situation because I'm limited to single phase power. I've already lined up at least 60A 220V supply but I...
Hello All,
I'm working on a residential vehicle lift and just found out that I'm limited to SINGLE PHASE power. I'd originally spec'd a 10HP motor tied to our pump and estimated a ~60second lift time. Now that I'm no longer able to get a 10hp motor I'm struggling to find a way to maintain the...
I'm making this part and ones like it, and my customer is flexible with regards to material and even slight design changes.
Part is finished to 12" on one side square and 2" thick. The stock will need to be oversized for machining. Customer initially specified Cold Drawn 1018 which isn't...
Mike:
The smaller section of the shaft went into the pinion. The larger section is in the gearbox.
I'm not familiar with the separation force you mention- where does this come into play? I definitely want to include this in future calculations.
There's only 1/8" of clearance above the...
I was advised by the gear machine shop to avoid hardening the 4340 too much as well. 300/340BHN (I assume this is approx 32-27 Rockwell C?) is what they specified in a quote.
This is interesting, I never investigated this treatment. Is it costly?
Two parts, yes, a gear and a stepped shaft...
See photos of the setup.
http://i.imgur.com/WHNwACl.png
Hi Folks,
We have some equipment that used a stepped shaft to fit an off the shelf gear with a smaller bore. The shafts are failing right where one would expect. I'm no expert at metallurgy but thought someone might recognize the...
This has been excellent feedback, thanks. I certainly understand the limitations of CAD vs Reality which is why I came here for advice on something!
The structure is a standard duty automotive lift. Non ductile components must have a Safety factor of 5+ which explains the large size of the pin...
I'm trying to find the best configuration for a joint on a lift we're designing. This is a heavy structure but I want the joints to be field installable, something that a tech can wrench and hammer into place.
I want to keep the two 1018 elements held together very closely so that there isn't...
Thanks Denial, that was the logical leap I needed.
I had actually already created a plot of H(L) (knowing there might be some value inherent to it)
http://imgur.com/RdTGmkC
When I take the derivative of this (dH/dL) I get the equation
dH/dL = 7.7901-0.0468*L
(at its minimum (zero...
I've been staring at these calculations for a while now and I've hit a stumbling block. I'm trying to determine the force needed by the actuators so I can size them and I'm not sure whether I'm off by a factor of two and doubling the sizes needed or not.
See the picture at this link...
