Pro-Jump PowerBocking Jumping Stilts Forum - Community for Power bocking / Pro Jumping!
YOUR JUMPING STILTS => Modifications => Topic started by: Wally247 on June 21, 2008, 09:47:23 PM
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at risk of getting abused im going to ask this question anyway.....
how does a bearing work... what are the different parts and how do thery work?
where should there be movement and what should be solid????
the only dt i ever did was woodwork so metal and mechanical things mean nothing to me... hence why im asking this question.
any explenation would be nice :biggrin: even better if its pj related with pics :biggrin: :biggrin:
thanks
-Calum the Confused
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at risk of getting abused im going to ask this question anyway.....
how does a bearing work... what are the different parts and how do thery work?
where should there be movement and what should be solid????
the only dt i ever did was woodwork so metal and mechanical things mean nothing to me... hence why im asking this question.
any explenation would be nice :biggrin: even better if its pj related with pics :biggrin: :biggrin:
thanks
-Calum the Confused
There are lots of different types of bearings. Your PJs have 3 per stilt,one in the hoof pivot,one below the foot plate and one on the spring pivot right at the top of the frame. In this case, the bearings are steel tubes that support the bolts which fasten the components together,helping to reduce the friction as the parts move against each other.Applying grease or oil helps reduce the friction even more and increases the life of the bearings but they'll wear out eventually. The bolts that pass through the bearings need to be quite tight to eliminate any play, but not so tight as to restrict the movement of the components. Hope this helps a bit! :thumbs:
Edit: Just came across this by Gillybert.
http://www.projumpforum.co.uk/index.php?topic=1271.0
-Nobby
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Close Nobby but you missed one
There is another bearing in the bottom of the Hoof (a lot of people miss that one I did at first)
You can get a good idea of how they work if you have a look at the mods I did to mine
http://www.projumpforum.co.uk/index.php?topic=826.0
They are really very simple Top hat Bushes
Jason :Hoofies2:
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In which case I shall hunt further to find this elusive bearing J!!! I like what you did on your lathe. A man after my own heart! I guess I may well have to find some brass bar (what OD stock did you use BTW?) and whip out the vernier calipers. :thumbs:
Nobby-
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Don't use Brass mate It doesen't stand the impact very well use Phospher Bronze or Ally Bronze and coat it with Molyslip
O/D was 3/4" before machining
Jason :Hoofies2:
Ps Ph Bronze is very dear at the moment
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I know a man who has 3/4" phospor bronze bar kicking around in our workshop! :thumbs:
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Make him an offer he can't refuse quickly :haha:
I've just climbed out of the loft having finnished a set of Glass filled Nylon bearings (the lathe is in the loft :biggrin:)
Should be interesting once I get a set to fit them in ( The Phossys don't seem to ever wear out so I'm gonna have to buy another pair :biggrin:)
Jason :Hoofies2:
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Thanks for all the feed back guys...
im still non the wiser thought it all goes "zooooooooom" right over my head...
Should be interesting once I get a set to fit them in ( The Phossys don't seem to ever wear out so I'm gonna have to buy another pair :biggrin:)
Jason :Hoofies2:
:haha: you can fit them in mine if you dont find another pair lol :biggrin:
i promice not to sue if i die? ;D
calum
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Nice try mate
But I am my own Crash Test Dummy :haha:
You should see the results of some of my failed attempts before you volunteer :biggrin:
I've had grown men screeming and hiding behind benches (and that was just my first test of a roller shutter door :haha:) It went off like a bomb
Jason :Hoofies2:
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:haha: :haha: It all goes over your head because you asked an engineering question and two engineers answered! :biggrin: :biggrin: Don't worry about them too much. As long as they're lubricated and clean they'll last quite a while. Jason will probably pipe up too. Just my humble opinion that lube of any kind attracts dirt and effectively turns it into grinding paste,which in turn makes the lubricated part wear out faster.....Maintenance is therefore necessary,in that taking them apart and cleaning off the crap will make your stilts last longer and ensure smooth,noiseless operation..... :thumbs: :thumbs: :biggrin:
-Nobby
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damn lol and there was i hoping to get som barings out of it lol
@nobby again with hte zoooooooooooooooooom all i understood of that was lubricant and grinding paste...
lol
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Nice try mate
But I am my own Crash Test Dummy :haha:
You should see the results of some of my failed attempts before you volunteer :biggrin:
I've had grown men screeming and hiding behind benches (and that was just my first test of a roller shutter door :haha:) It went off like a bomb
Jason :Hoofies2:
How the hell did you blow up a roller shutter? Want some pointers on how to fit 'em Reaper? I've done a few myself, manual (usually spring assisted) and motorised.....Lemme guess....You pulled the spring retaining pin before you'd loaded the shutter? :o
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damn lol and there was i hoping to get som barings out of it lol
@nobby again with hte zoooooooooooooooooom all i understood of that was lubricant and grinding paste...
lol
Well...Get an old T-Shirt(make some rags),get the spanners out and take 'em apart....See how they work...Clean and re-lubricate the moving parts as you re-assemble 'em...Sorry,I like taking stuff apart.... I have very quiet PJs...... :biggrin:
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Now your first mistake was to assume I was "Fitting" a roller shutter (been there done that nearly lost the fingers :biggrin:)
No No that would be too simple
I was making a roller shutter out of MDF and Broom handles (don't ask why life is to short to explain it :biggrin:)
Things went well until something jammed and the whole lot buckled at the top and then suddenly released
All kidding aside we found a screw embeded in the wall afterwards and were picking bits up for days after
my old guvnor was covered in sawdust when a lump took out the extract unit bag and I was a mass of bruises for weeks after
The bang it made was awsome I had ringing in my ears for 2 hours after
But that was tame compared to the Helicopter Router incident :haha:
As for lubrication I found silicon grease to work well and it dosen't pick up the rubbish as much
Jason :Hoofies2:
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I knew I shouldn't have asked....MDF and broom handles? And I made a mistake? :biggrin: :biggrin: :nana:
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It worked right up till it Didn't :nana: and quite well actualy but I wasn't allowed to develope it further :haha:
Due to health and safety I was told to fit sliding removable doors :biggrin:
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Reaper,If ever I get to meet you,face to navel, 'cos I'm only 5'9" :biggrin:, Do me a favour and remind of the "Firework code" will ya?...I'll bring a Taper.....Then I'll light the blue touch paper and retreat to a safe distance!!!!! :biggrin: :biggrin:
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I think my mate summed me up well one day when he noticed that I have 6 full sized commercial fire extinguishers in my house and said have you got enought of those
And there wasn't a hint of sarcasm in his voice he genuinly thought a couple more would be a good idea :biggrin:
He also won't get into a car with me unless it has a full roll cage :haha:
Jason :Hoofies2: