I am looking for a solution to a highly specialized application. A google search led me to this forum, so I apologize if this post is out of place. Please ignore if so. I need a highly durable, affordable way to direct force from a 1.5"x16" stroke hydraulic cylinder linearly. This application would encounter different surfaces at it's contact point. My intuition is to use two 1.5" stainless steel shafts parallel, connected by a steel plate, utilizing either a linear bearing (expensive), or preferably, some type of poly/UHMW/nylon lined bushing suited for linear and angular forces. I have extremely limited knowledge of machining or material. I apologize if this extremely rookie question is obvious. This forum seems very capable of pointing me in the right direction. Thanks in advance!
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OT - Need help with highly durable linear bearing/bushings
- Thread starter neidig_09
- Start date
- Replies 17
- Views 1,539
Tom
Cast Iron
- Joined
- Mar 18, 2003
- Location
- Upstate New York USA
try trustycook they make lathe spindle liners out some good stuff like you are looking for Trusty-Cook - The Leader in Industrial Urethane Products
JRIowa
Diamond
- Joined
- May 27, 2003
- Location
- Marshalltown, Iowa, USA
How much weight will the linear bearing have to carry?
Since it's hydraulic, I'm going to guess there's not that much speed?
How much accuracy do you need?
Any somewhere over 16" of travel?
Why the stainless?
And most important, what's your budgit?
JR
Since it's hydraulic, I'm going to guess there's not that much speed?
How much accuracy do you need?
Any somewhere over 16" of travel?
Why the stainless?
And most important, what's your budgit?
JR
DavidScott
Diamond
- Joined
- Jul 11, 2012
- Location
- Washington
I don't think urethane liners are the right direction. How much side load are you expecting? Off the top of my head I would look at Pacific Bearing, or companies like them. The price of the shafts and bearings are pretty damn reasonable, resin bearings being in the range of $15-$25 for that size.
Richard King
Diamond
- Joined
- Jul 12, 2005
- Location
- Cottage Grove, MN 55016
Check these guys out. They also have an in-house engineer staff that can help you use the best products. They sell a lot of Rulon 142 to the machine tool builders in Taiwan and here in the USA. Bearing Manufacturer | Bearing Suppliers | TriStar Plastics Corp.
If your worried about giving them to much info to them I bet they would sign a confidentiality agreement. Rich
If your worried about giving them to much info to them I bet they would sign a confidentiality agreement. Rich
SteveBausch
Stainless
- Joined
- Jan 11, 2010
- Location
- Indianapolis
What are the side loads?
What thrust is required?
Single acting or double acting?
The old-school in-ground auto lifts don’t require guide rails to stabilize the platform; perhaps you could consider a cylinder with an oversized “rod”, and an over length tube, to keep 50% of the rod in the tube, for rigidity.
Which is most likely the design currently on the market.
What are you reverse-engineering?
Building a cylinder isn’t hard; Abom79 produced nice videos on cylinder repair.
http://www.practicalmachinist.com/vb/general-archive/hydraulic-cylinder-design-87152/
What thrust is required?
Single acting or double acting?
The old-school in-ground auto lifts don’t require guide rails to stabilize the platform; perhaps you could consider a cylinder with an oversized “rod”, and an over length tube, to keep 50% of the rod in the tube, for rigidity.
Which is most likely the design currently on the market.
What are you reverse-engineering?
Building a cylinder isn’t hard; Abom79 produced nice videos on cylinder repair.
http://www.practicalmachinist.com/vb/general-archive/hydraulic-cylinder-design-87152/
Up to roughly 1000 lbs of force linearly, up to maybe 300 lbs "side load"
16" stroke in somewhere around 1.5 seconds, so not a lot of speed, no.
Accuracy is not key. Anywhere under 1/4" side-to-side movement 12" from the bearing would be fine (not sure how to quantify that)
Stainless for durability, corrosion, and marketing
I'd like the "rail" and carrier/bearings/sleeves/bushings all together to stay under $200 if possible.
Side load total around 3-400#'s probably
That is basically what I need, yes, but there are other reasons I need the rail system, such as system compactness. I can't show you the machine because it does not exist. That's why I need your advice.
Thanks! I'll look into them. I'm not too worried about NDA's or anything, as my application is extremely specialized and this portion would not be the proprietary portion.
I'll check into it. Thanks!
Approximately 3-400 lbs side load, roughly 1000 lbs of force linearly
Double-acting cylinder/stroke
Utilizing the ram of the cylinder is not ideal, mainly for spatial reasons, partly for wear. The size and weight of a cylinder required to be durable enough in that respect would be prohibitive.
I'm not sure what design you're referring to "on the market"
I'm not reverse engineering anything. That would be fairly pointless if this application already existed.
Thanks for the tip on building cylinders. I have no need nor inclination to build them. They're pretty affordable as is...
Yes, extreme dust and dirt.
Normal midwest temperature ranges (20 degrees F - 100 degrees F)
Exposed to weather, potentially mud (not likely)
No lubrication restrictions. Could be anything.
Thanks!
