This be of use in your home gym? Potential product.
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Thread: Opinions, muicroloading plate
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01-22-2013, 08:58 PM #1
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01-22-2013, 09:18 PM #2
A 2" flat washer is another alternative to a square washer. This one costs around $3.14 each and according to the specs it weighs around 0.560700 lbs. You might be able to find them cheaper locally or on eBay. You can glue them together for larger weights. I got the idea from Starting Strength.
http://www.drillspot.com/products/10...ss_flat_washer
Edit: To fit on cheap import bars, it might be necessary to use washers with a larger center than 2"... maybe 2 1/8... dunno... it would depend on the bar.Last edited by morebarbell; 01-22-2013 at 09:23 PM.
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01-22-2013, 10:17 PM #3
The spec for a 2" USS flat washer allows for a thickness between .153" and .213". Any washer with a thickness between those two numbers meets the spec. Since the weight of the washer is directly proportional to the thickness, the weight variation between washers can be as much as 40%. Washer manufacturers are not shooting for .560700 lbs, they are trying to make the most profitable washer that meets the spec.
Anyway, my price target for a plate, that weighs within 3% of .5 lb, would be in the range of $3.00 to $4.00 per plate , which is about what you pay for a 2" washer that can have a 40% weight variation.
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01-22-2013, 10:22 PM #4
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01-23-2013, 12:13 AM #5
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01-23-2013, 03:13 AM #6
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I've been toying with the idea of getting a local machining school to make micro plates for me that are much more wider than what my dumbbells currently do, they would be really thin and I'd have a lot of them so I could turn my dumbbells into higher weight ones..so I think your idea is good too, and really easy to do in most machine shops(if they got the right kind cutter they could easily turn a 2mm metal sheet into several of those "plates", the only problem would be the hole tolerances probably when mass producing them..hmm stack them together in a jig and run a cnc machine to finish up the holes..would work).
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01-23-2013, 09:18 AM #7
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01-23-2013, 09:33 AM #8
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01-23-2013, 09:36 AM #9
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01-23-2013, 10:24 AM #10
Sherm, this could potentially be an excellent product for on-the-bar weight calibration as it's usual for olympic plates to have some deviation from the stated weight. I'll consider buying your microloading plates if you offer a selection of weights as a set. Say 1/8, 1/4, 1/2, 3/4, 1, 1 1/4 lbs plates with a margin of deviation 2-3%.
For example, one of my Ivanko 25 lbs plates is 24.6 lbs. I could use your microloading plate to compensate for .4 lbs discrepancy.
Mark Rippetoe measured and put exact weight number on the dumbbells in his gym. Same could be done for plates. And whatever the deviation is be compensated by your microloading plates. Would be nice have them colored too and have wide enough center hole to fit on most bars.
Also it might be good for those doing olympic weightlifting. Found this quote on amazon customer reviews for CFF fractional weights:
Originally Posted by NorwichGrad
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01-23-2013, 12:35 PM #11
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01-23-2013, 01:03 PM #12
You can do a permanent calibration on your out-of-tolerance plates by modifying them. Some number of lead fishing sinkers can be epoxied to underweight plates. Holes can be drilled in overweight plates to remove material. If aesthetics are important, holes can be filled in with a low density material and then repainted.
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01-23-2013, 04:17 PM #13
This might be good for larger deviations. What would you recommend to permanently compensate for - 2.1 lbs deviation on one of my 25 lbs CAP plates. That's the worst off one among my plates (-8.4%).
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01-23-2013, 04:52 PM #14
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01-23-2013, 07:10 PM #15
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01-23-2013, 07:19 PM #16
JB-Weld and JB-Kwik are awesome. I use them all the time.
Mixing can be a hassle though. If that's a concern, there's some clear stuff - don't remember the brand name - that comes with the resin and hardener in side by side syringes. You attach a mixing nozzle on the end and then just squirt it into place. They provide two nozzles so that you don't have to use it all in one go. (Anything left within the nozzle after about five minutes gets hard and plugs it up.)▪█─────█▪ Equipment Crew #35
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01-23-2013, 07:27 PM #17
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01-24-2013, 04:21 AM #18
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01-24-2013, 04:46 AM #19
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With weight deviations like that I would be looking to sell them, and buy different ones, in fact I already did. I would especially if I lived in the states with the choices you guys have.
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http://forum.bodybuilding.com/showthread.php?t=153596291&p=1062453741#post1062453741
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01-24-2013, 10:30 AM #20
Thanks, lots of good information and ideas.
I've got to keep this potential product very simple. So the objective is to be able to add weight to the bar in one pound increments. With a set of eight plates you could add one pound at a time up to four pounds, then, for the next step, switch them all for a pair of 2.5's. Of course, there is no end of combos that could be used..
As far as price goes, I'm figuring on $35.00 for a set of eight, including US shipping. Any number less than eight would be $4.00 per plate plus $5.00 shipping (not per plate, for the whole package - example, three plates would cost a total of $17.00 shipped).
The big question: Is there a market for it?
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01-24-2013, 11:08 AM #21
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01-24-2013, 11:43 AM #22
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This is true, however if you buy them from a distributor like say, Fastenal, and not out of a bin - you will/can keep their control numbers the same. Places that sell large quantities of fasteners have to be able to track what manufacturer and batch they came from in case a bad batch is identified and the fasteners need to be removed from service/shelves.
I had a customer whose required washers to be the same thickness - not to a spec, but just that they were the same on each side. We found that washers from the same batch were almost always identical and likely stamped from the same sheet.Boomer Rep Crew #1
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01-24-2013, 12:26 PM #23
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01-24-2013, 12:37 PM #24
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Hate to burst your bubble but this product has been around for ages.
http://www.amazon.com/CFF-Olympic-Fr...ctional+Plates()---() York Barbell Club #26 ()---()
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01-24-2013, 12:41 PM #25
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01-24-2013, 12:45 PM #26
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01-24-2013, 01:37 PM #27
When do you think you'll be able to start selling them? I am interested in buying a set of your microplates for doing Rippetoe tricep extensions with a Swiss bar.
P.S. I think lettering could be a little better than 1/2 lbs handwriting as you have it on the plate in the picture. And please, make holes wide enough so that they could fit on specialty bars.Last edited by Jetigen; 01-24-2013 at 01:43 PM.
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01-24-2013, 03:44 PM #28
http://www.roguefitness.com/iron-woo...nal-plates.php
Am I missng something?
Surely if I'm paying for precision, a few bucks saved will not steer me towards some scrap metal squares over a uniformly sized and nicely finished product.[̲̅$̲̅(̲̅ ͡° ͜ʖ ͡°̲̅)̲̅$̲̅] Equipment Crew #57 [̲̅$̲̅(̲̅ ͡° ͜ʖ ͡°̲̅)̲̅$̲̅]
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01-24-2013, 04:51 PM #29
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01-24-2013, 04:58 PM #30
He uses different approach. There is just one fraction: 1/2 lbs. It makes micro weight increases easier compared to multi-fractional plates. You just keep putting his 1/2 lbs plates on the bar till they reach total of 2 lbs. The next step you use 2.5 plate and start over with the 1/2 plates. To me this way is more user convenient.
I am also gonna get the traditional multi-fractional set for on-the-bar weight calibration.
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