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Category: Steering & Suspension Price (no $ sign please): $999 Private or Vendor Listing: Vendor Listing Part fits (select ONLY those which apply): 911, 912, 928, 964, 986, 987, 993, 996, 997, Cayman, Carrera GT, Race Car, Other Marques Location (Region): Midwestern Item Condition: Brand New
PROUDLY ENGINEERED AND MADE IN THE UNITED STATES OF AMERICA
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From the start we set out to create a product to give racers a reliable, robust system to align their race car at home or even the paddock. We believe you shouldn’t need to spend a fortune to precisely align your car or even need to go to a professional shop. We worked with numerous racers, engineers, and mechanics from which we are proud to present our Precision Hub Stands. Made with 6061-T6 aluminum and hardened steel components our system has a stout frame system. We then utilize high grade Made in USA ball rollers and hardened steel pivot bolts to create an extremely low friction surface for caster, camber, and toe measurements; virtually eliminating all resistance that a tire presents. Turn Plates and rolling your vehicle back and forth with every alignment change is a thing of the past! Each Precision Hub Stand is capable of supporting 1000 lbs or up to 1250 lbs depending on the selected option. Adjustable in 1/4″ radial height increments they accurately represent the tire height of almost any sports or race car in the world. Precisely mounted Toe Bars allow for incredibly accurate toe measurements! With rare earth magnets on every Toe Bar you don’t have to worry about the tape measure coming off either. Using threaded feet the Hub Stands can be held in place when needed as well. When it comes to Hub Stands, no other company offers the smoothness of numerous ball rollers, the weight capacity, or the caster/camber abilities. What’s Included:
Four (4) Precision Hub Stands adjustable from 11.50″ to 15.50″ radial height with your lug pattern of choice*
Four (4) 24” Toe Bars with spacers and attached magnets
I think you have design flaw and will need to re-engineer these before you can safely sell them. 911's are rear weight biased and nowhere near 50/50 Front-Rear weight distribution. If each stand is rated to 1000 pounds, they are woefully inadequate for most modern 911's. Last 997 turbo I saw on corner scales was well over 1000lb per rear corner. Probably best not to market an unsafe product here.
Thanks for the reply! Hub Stand Overview:
Per the above, each stand is rated at 1000 lbs. This rating is limited by the ball casters that the system rides on to ensure a low friction environment. The true limit of the frame of the system is in excess of 6000 lbs. This stress analysis can be viewed here:
So, we rate them at 1000 lbs to ensure the ball casters have a long lifespan. If someone wanted a set of stands to handle a greater weight we would gladly add addition ball casters to handle it.
Different Weight Distributions:
If we look at various weight distribution we can find what the maximum vehicle weight is each case to not exceed 1000 lbs at a wheel.
50/50 Distribution: 4000 lbs total weight
55/45 Distrbution: 3636 lbs total weight
60/40 Distribution: 3333 lbs total weight
Various Porsche Vehicles:
1999 911 Carrera:
Weight: 2904 lbs
Distribution: 60/40
Weight at Rear Wheels: 871 lbs (Acceptable)
997 Carrera S:
Weight: 3153 lbs
Distribution: 60/40 (rumored to be 61/39)
Weight at Rear Wheels: 945.9 lbs (Acceptable)
If we look at the GT3 versions of the 997 generation, they are quite a bit lighter since they are track oriented but if we look at the 997 Turbo it weighs more than the allowed limit of 3,330 lbs for 60/40 distribution as stated above. In this case you can give us a call or email and we will customize a set to meet your weight requirements! This isn't an uncommon occurrence and is no big deal for us to work with you on! We hope this eased your concern.
If anyone has questions on their vehicle's weight/distribution we would be more than happy to work with you through that as well to find the ideal set of Precision Hub Stands!
Thanks!
Colton @ CSM Performance LLC
Last edited by CSM Performance; 09-26-2018 at 11:51 PM.
The FEA is only for the hub plate. I have no doubt the plate can withstand huge load being a solid chunk of 6061. Have you tested the entire construct in an MTS? Needs to be the entire unit loaded to failure. Each hub plate is secured by two pivot bolts. I would bet the failure point is there. I crawl/lean under cars when doing an alignment and corner balance. A failure could be life threatening for an operator. If you can get confirmed load ratings then I think you have a great product. It would certainly save me a bunch of time compared to traditional alignment.
We did not go into depth on the engineering of each component as this is somewhat proprietary. I will go into a little more depth for you though. The two pivot pin are 5/16'' shoulder bolts with a minimum shear strength of 84,000 psi.
If we look at the cross sectional area of the pivot pin we find ->
A=pi*r^2 ->
A = 3.14*(5/32*5/32) ->
A -> 0.0766 in^2
Now we can look at it from a single shear perspective as shoulder bolts are in single shear.
T = F/A ->
where T allowable is 84,000 lbs/in^2
84,000 lbs/in^2 = F/0.0766 in^2 ->
F_allowable = 6434 lbs.
This is failure strength (we rate all of our safety factors with yield strength)
So in terms of yield
F_allowable_yield = 4063 lbs
That is only for one pin in single shear which the system utilized two pins in single shear equating to
F_allowable_total_yield = ~8000 lbs.
This means that the pivot pins exceed the load limit of the main Hub Mount Plate.
Note: That is a simplified walk through but will give you the main idea.
Nice! It's good to have a manufacturer who can back their statements with appropriate data. That is all too rare these days. I have more confidence although it would still be reassuring have an MTS load an actual stand to failure.
We have done extensive in-house testing to find the real world high stress areas and where they will yield first. The results were almost always extremely similar to the FEA predictions. I don't want to go too deep into it as it was in-house but the failure points were well beyond anything a vehicle will see! We greatly appreciate the criticism as we believe more companies should be asked the difficult questions instead of just accepting what they have designed. We will be more than happy to discuss any questions you have! We would like to note, we greatly prefer to make custom plates with the ball seat tapers for European vehicles (which we will do at no cost) but we found the 60 degree taper to be suffice for locating and retaining since the lug nut/stud torque values are decreased when on the stand. No need to torque to 100 ft-lbs or so since this is a statically loaded environment with minimal side loading. Don't worry, the torque specs for all components and for installation are listed in the user manual. We can also discuss the clamping force that we calculate with our given torque values on the lug studs/nut
User manual link: L
ink
You can also check out a couple of our tech articles at: Link
Once again we are more than happy to discuss any topics related to our Precision Hub Stands!
Colton @ CSM Performance LLC
Last edited by CSM Performance; 09-26-2018 at 11:52 PM.
We finished up some design changes to increase the load bearing capacity of our Precision Hub Stands. You can view the conversation above regarding this topic. We have added an additional option to increase the Weight Rating to 1250 lbs per Precision Hub Stands. This consists of modifying the Base Plate and adding additional Ball Transfers for improved force distribution and capacity. You can view our Precision Hub Stands at: Link
Thanks!
Colton @ CSM Performance LLC
Last edited by CSM Performance; 09-24-2018 at 03:05 PM.
09-10-2018, 04:51 PM
CSM Performance LLC Precision Hub Stands
