pillow bearings

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Where is a good place to get pillow bearings at?  I have an overhead boom that I need to make at work to hold a florescent light fixture / exhaust line for my welding block.Welding Supervisor Department of Corrections.
Reply:mcmaster carr or carr laneLast edited by brucer; 08-17-2011 at 09:03 PM.tackleexperts.comwww.necessityjigs.comhttps://www.facebook.com/groups/mach...dingequipment/
Reply:Motion IndustriesDisclaimer; "I am just an a$$hole welder, don't take it personally ."
Reply:Just a thought before I do any ordering, will a pillow bearing hold up under a horizontal load?  I plan to press in a ten inch length of mild steel bar or what ever type of steel bar is on hand ( mild to various strengths and alloys )  for the back bones and square tube and angle for the primary body of the boom.  I figured that it would be better to go with pillow bearings instead of a tube and rod hinge pin set up so there is no gouging and degradation of the metal to metal of the tube and pin set up given the weight at the pivot points.  Length should be around 12ft from H beam mount to the end of the boom where the fixture is at, tallest point of the triangle portion of the boom should be about 3.5ft.  Material is ultimately dependent on what ever scrap I can get my hands on so width and thickness will vary but I will try to stay uniform.Welding Supervisor Department of Corrections.
Reply:surplus center has good prices
Reply:all the jib cranes i've ever seen the masts were round with gussets on the bottom at the base and had bearings at the bottom and top of the swivel head...  i'm not an engineer but i dont think pillow bearings will work.. if this is for a business there are regulations on jib cranes, you might check on it..Last edited by brucer; 08-17-2011 at 10:26 PM.tackleexperts.comwww.necessityjigs.comhttps://www.facebook.com/groups/mach...dingequipment/
Reply:It would seem to me that you might not want it to move too easily, so maybe ball bearings are not the best choice.   Bronze bushings might be a better choice, some bronze bushings have a shoulder, so they would do well in terms of holding the boom from sliding down.  Search for "flanged sleeve bearings".McMaster again is a good spot for that type of thing.  Also MSC or Grainger.   Note that Grainger stocks many items, but on line they have many things not in stock, but that they can get.   The numbers that they quoted me were astronomical, something like 50,000 different items in the catalog, but 500,000 on line.   They just ordered me something that was on line, but not in the catalog, not in stock at Grainger.  They said that it would probably be about a week.   They were cheaper than the only other source that I could find.the kind of bearings you are talking about probably cost around $5 each, so not a big investment.RichardSculptures in copper and other metalshttp://www.fergusonsculpture.comSyncrowave 200 Millermatic 211Readywelder spoolgunHypertherm 600 plasma cutterThermal Arc GMS300 Victor OA torchHomemade Blacksmith propane forge
Reply:VXB has a different bearings on the website.MarkI haven't always been a nurse........Craftsman 12"x36" LatheEnco G-30B MillHobart Handler 175Lincoln WeldandPower 225 AC/DC G-7 CV/CCAdd a Foot Pedal to a Harbor Freight Chicago Electric 165A DC TIG PapaLion's Gate Build
Reply:Originally Posted by TozziWeldingMotion Industries
Reply:Originally Posted by acourtjestersurplus center has good prices
Reply:Pillow blocks are good for radial loads, but not so great for axial (thrust) loads.
Reply:Unless you want your light and fume/smoke sucker to swing with the wind, maybe a simple plain bearing would be better.  One tube inside of another with some High Molecular Weight Poly Propolyne for a bearing.  I was going to suggest that you put a shaft inside of a tube with grease, but then considered you might have an O/A torch in the area. Sometimes, too much freedom of movement is not a good thing.I offer three choices: Good, Fast, & Cheap. You may pick two.Hobart AC/DC StikMate LXHarbor Freight AD HoodHarbor Freight Industrial Chop SawDeVilbis 20 Gallon, 5 HP Compressor
Reply:Mc Masters, Msc, Grainger are good choices  but don't forget your local farm store or check your yellow pages under power transmission.Tough as nails and damn near as smart
Reply:Perhaps search for ' thrust bearings' ?Weldandpower Lincoln 225 AC,DC with Briggs 16hp gas engine.WW2 era Miller TIG.
Reply:It would take forever for a pin and bush setup to wear through under normal use Big65. Radial bearings can take good thrust loads but people get in trouble fixing bearings on either end of a shaft that can warm up, grow and put huge thrust loads on the bearings. Cone bearings don't like that either.If you want pillow blocks, first check with supervision to see if there is something in maintenance or possibly the parts crib you could have. If not then mail order is not that bad, or like above check power transmission.The cantilever load is complex when considering thrust on the bearing mount. Almost all the load is tension/compression (radial to the bearing) when the load is at max distance. Almost all the load is vertical (thrust) when the load is close to the column.I built a small 6' jib last year from junk in the shop for my small downdraft using 1" bearings at a 12" distance. Since it is free column mounted, 200lbs is the max I'll put on it without building a strongback for the post. It does what I wanted it to do but like mentioned above it swings very freely and needs plumbed and leveled well.The column is .25: wall low alloy tubing,The entire load is on the lower bearing in thrust with this setup.Matt
Reply:You could use a couple pillow bearings and weld the collars in place to keep the shaft from shifting and use a couple to spread the load around.Another consideration may be bushings but you have to watch the thickness as thin bushings will bind up.Could always look into making collars out of pipe and pouring babbit, which may be a cheap route.
Reply:Originally Posted by Matt_MaguireThe column is .25: wall low alloy tubing,The entire load is on the lower bearing in thrust with this setup.Matt
Reply:Forgot to add that this boom will be inside a large waterfront type of warehouse and the only real air movement is from two fans I have in my block which are always angled towards my miller 351 from the stone age.  I've got a very low tech antique style of putting resistance on the pins to limit movement using leather which is always in abundance where there are welders.Welding Supervisor Department of Corrections.
Reply:Be nice to see a sketch of how you plan to clamp/mount the plate or plates to the building column. If something looks like you can lift with it by using a come-along or chain fall, somebody will try... There's a reason store bought sucker arms are counter-balanced for a 5-10lb pull in any direction (you can't hang heavy stuff on them).Unless the stainless is pump shafting (expensive) it won't go through the bearings without a crap ton of polishing. Commercial stainless round is ground oversize and it's common to find 1" is actually 1.0005/1.002". The bearing is ground to .99998"/1.0000". More common for strength is 1045 TG&P which will be .9994/.9996". Cold rolled that size will be .998/.999", usually closer to .998" (it is allowed -.005" from the mill). If you are worried about rust just coat the shaft with something.You think a Miller 351 is stone age??? Jeeeze I gotta get away from this stuff...MattLast edited by Matt_Maguire; 08-22-2011 at 01:14 PM.
Reply:Bearings (of pretty much all types) are rated for the various loads and speeds they are 'good' for.  Radial load, thrust load, rpm, etc, etc. Check the specs (or have one of the design/engineer types do so) and use the right tool (or in this case, bearings) for the job.btw, one way to have the bearings arranged is to have one (set) of bearings/bushings for the radial load and then have thrust bearing(s)/bushing(s) for the thrust load.  Or for industrial usage, just go and buy (or have the company/boss buy) the desired smoke sucker.  This way you avoid all sorts of potential OSHA and such safety reg and violation issues.  IMO.  The best laid schemes ... Gang oft agley ...
Reply:Sorry meant miller 300, this thing is the size of a 1940's am radio cabinet floor model weighing about 500lbs.  Its all knobs  and levers with no kind of readout at all what so ever but it does work solid whether running liquid cooled tig or gas cooled tig.We have all sorts of rod here in the yard and I can grab a foot long section of any type.  I may have to rethink the mount as the H beam has some electrical conduit on it and there is a high pressure feed line running just below its crown so I may have to grab some square tube and plate and make a stand and weld the top to the horizontal H beam.Give me a day or two to get a sketch up, I just got the pc working right after replacing a bad video card and fixing a sound issue that showed up because of it.Welding Supervisor Department of Corrections.
Reply:I dont have a sketch but here is a clamp similar to what I'm going to use.  There are two more spots for additional bolts to go through so I'll have a second bolt coming through the opposite side and the plate will be welded to the backside so there will be one bolt sticking out from the side and another sticking inside.  There will be two plates and each plate will have four clamps and each clamp is roughly the size of a racket ball and is very durable.  They serve multiple jobs as grounding clamps for welding boxes or as clamps for holding parts together for welding with a 1 inch wide opening. Attached ImagesWelding Supervisor Department of Corrections.