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Post by geh3333 on Mar 23, 2015 10:56:29 GMT -5
I do not have a scale that reads down to the 10th of a gram , and was wondering if anyone has ever weighed their roller or slider weights down to the tenth of a gram. If so , how accurate are the weights. For example are the 11g weights actually 11.0 grams , or are some 11.2 , 10.8 and so on . I have a pretty accurate scale and at times some of my 11 gram weights will go up to 12g then back down to 11g ,and some will be at 10g and go up to 11g after a few seconds. I understand it all depends on if you set them down harder on the scale they will weigh a little more for a second or two , but even if I set them down easy , they all seem to bee slightly off from each other.
The point I'm trying to make is that ,some of us have to mix two different size weights to equal a .5 mixture , like 11.5 or 10.5 . the .5 makes a big difference if you are trying to tune your CVT so you can reach a certain rpm at a certain speed, so if these variator weights are off by .2 or .3g , this could be an issue . at the same time you want the variator to run as smooth as possible , so if the weights are off then the variator is not running as smooth as it should be ,and this could then cause early belt ware and or early crank bearing issues.
I'd like to hear others thoughts.
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Post by lain on Mar 23, 2015 11:01:22 GMT -5
I do not have a scale that reads down to the 10th of a gram , and was wondering if anyone has ever weighed their roller or slider weights down to the tenth of a gram. If so , how accurate are the weights. For example are the 11g weights actually 11.0 grams , or are some 11.2 , 10.8 and so on . I have a pretty accurate scale and at times some of my 11 gram weights will go up to 12g then back down to 11g ,and some will be at 10g and go up to 11g after a few seconds. I understand it all depends on if you set them down harder on the scale they will weigh a little more for a second or two , but even if I set them down easy , they all seem to bee slightly off from each other. The point I'm trying to make is that ,some of us have to mix two different size weights to equal a .5 mixture , like 11.5 or 10.5 . the .5 makes a big difference if you are trying to tune your CVT so you can reach a certain rpm at a certain speed, so if these variator weights are off by .2 or .3g , this could be an issue . at the same time you want the variator to run as smooth as possible , so if the weights are off then the variator is not running as smooth as it should be ,and this could then cause early belt ware and or early crank bearing issues. I'd like to hear others thoughts. I actually recently ordered a jewelry scale for that purpose. I'll let you know when I weigh them! I'll probably do that today, the package has been sitting on my work table for days lol |
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Post by geh3333 on Mar 23, 2015 11:08:13 GMT -5
Just to add a little more , let's say you have 6 - 11 gram roller weights and two of them weigh 11.0 , another two weight 10.9 and two weigh 11.1 . as the variator spins and pushes the belt up the face , the weight will not be event distributed on the belt . a .5 difference in roller weight makes a big difference . so the .2 g weight difference between the 10.9 and the 11.1 will cause the variator to run uneven and not smooth . is this why some have so much noise from their rollers ? Can a little dremmel work go a long way ?
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Post by geh3333 on Mar 23, 2015 11:09:25 GMT -5
I do not have a scale that reads down to the 10th of a gram , and was wondering if anyone has ever weighed their roller or slider weights down to the tenth of a gram. If so , how accurate are the weights. For example are the 11g weights actually 11.0 grams , or are some 11.2 , 10.8 and so on . I have a pretty accurate scale and at times some of my 11 gram weights will go up to 12g then back down to 11g ,and some will be at 10g and go up to 11g after a few seconds. I understand it all depends on if you set them down harder on the scale they will weigh a little more for a second or two , but even if I set them down easy , they all seem to bee slightly off from each other. The point I'm trying to make is that ,some of us have to mix two different size weights to equal a .5 mixture , like 11.5 or 10.5 . the .5 makes a big difference if you are trying to tune your CVT so you can reach a certain rpm at a certain speed, so if these variator weights are off by .2 or .3g , this could be an issue . at the same time you want the variator to run as smooth as possible , so if the weights are off then the variator is not running as smooth as it should be ,and this could then cause early belt ware and or early crank bearing issues. I'd like to hear others thoughts. I actually recently ordered a jewelry scale for that purpose. I'll let you know when I weigh them! I'll probably do that today, the package has been sitting on my work table for days lol I went to Walmart to buy one Saturday but they didn't have one . I'll have to try somewhere else or order one. I'm very interested to here your results ! Also if you have stock rollers and koso or other name brand rollers or sliders like ncy or Dr pulley , I'd like to hear the results from those also. |
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Post by lain on Mar 23, 2015 11:23:51 GMT -5
I actually recently ordered a jewelry scale for that purpose. I'll let you know when I weigh them! I'll probably do that today, the package has been sitting on my work table for days lol I went to Walmart to buy one Saturday but they didn't have one . I'll have to try somewhere else or order one. I'm very interested to here your results ! Also if you have stock rollers and koso or other name brand rollers or sliders like ncy or Dr pulley , I'd like to hear the results from those also. I have a couple sets of stock OEM rollers, a set or dr pulley sliders, and a couple sets of heavier rollers I got with my BBKs, I believe them to be 8g weights. We'll see soon though! I'm probably going to take the 2 sets of rollers I got from the BBKs and see which of all of them are the closest weights and try to get a mostly even setup. They don't normally sell those scales at supermarkets. You would probably find them online or in headshops where they sell things like water pipes and whatnot. Depends on where you are I suppose though, since they don't sell them in a lot of places in Boston because they are often used as scales for drug pushers. |
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Post by lain on Mar 23, 2015 11:28:09 GMT -5
Just to add a little more , let's say you have 6 - 11 gram roller weights and two of them weigh 11.0 , another two weight 10.9 and two weigh 11.1 . as the variator spins and pushes the belt up the face , the weight will not be event distributed on the belt . a .5 difference in roller weight makes a big difference . so the .2 g weight difference between the 10.9 and the 11.1 will cause the variator to run uneven and not smooth . is this why some have so much noise from their rollers ? Can a little dremmel work go a long way ? I personally would mostly be worried about the size of the rollers after dremel work and possibly making a mistake. I can't even cut a perfect hole, always end up making egg shapes or weird polygons when trying to cut with it, not exactly a steady hand type guy. |
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Post by JoeyBee on Mar 23, 2015 12:04:56 GMT -5
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Post by lain on Mar 23, 2015 12:22:57 GMT -5
From the weights that were in the stock variator before the first variator change, so very heavily used (no idea what brand): 4.96 4.96 5.04 4.91 4.98 4.97 From the weights from my first BBK, light use (Dongxin brand): 7.99 8.00 8.00 7.96 8.01 7.98 So, the difference between weights does not seem like too much I would think. I am suprised at how close to 5g my stock weights were, I used them up till about 6 months ago! Did most of my miles on them. I can't find my dr pulley sliders or my other set of stock type weights that are much fresher than the ones I weighed above. I think they may be in a box somewhere... I will let you know if I find them though! While we're on the topic, does anyone have any heavier weights than 8g that they either do not have a use for or are lightly used spares that never see any use anymore? I could pay shipping if needed  I wanna experiment with weights but do not want to buy a bunch of packs of weights just to do so. They are expensive when on a shoestring budget. |
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Post by geh3333 on Mar 23, 2015 12:34:42 GMT -5
There not as bad as I thought . looks like the furthest off is .1 . I'd like to do a little more testing on the rollers I have but the results so far don't seem too concerning.
If you slightly dremmel out the center , as long as its somewhat consistent it shouldn't matter if its not cut evenly, since the outside of the roller is untouched and the weight is still thrown outward . I don't think the center matters too much , u wouldn't have to take too much mmatterial out of the center to make them all evenly the same weight.
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Post by geh3333 on Mar 23, 2015 12:50:53 GMT -5
The 15.03 and the 14.  difference kinda concerns me. I'd have to use my dremmel to make them all the exact same weight . fixing the .1g difference may make the variator run a little smoother. How much ? May not be noticeable to the human ear or eye but I would imagine it would be better for the cvt especially in the long run . As the variator spins the weight of the rollers doubles , triples and so on , so a .1g difference soon becomes .2 .4 and so on . I wonder what the weight of an 11 gram roller becomes as it is spinning at 7500 rpms ? We could be talking about a couple gram difference at 7500 rpms , this may be enough to cause an imbalance and an unsmooth rotation ? |
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Post by mrpalmetto on Mar 23, 2015 17:29:08 GMT -5
I have the same cheap scales bought on line. You really have to be sure you don't change the weight too quickly from one to the next. These scales need a few moments between weighs and also you will notice the scale may not go to zero when the weight is removed and leave some 10ths showing as you quickly get ready to weigh the next weight. You will also do good to turn the scale  degrees and reweigh them all again, taking time to let the scale zero itself. Unless you have a relatively decent priced scale, you can't expect a great readout that you can bet the farm on, on a scale that costs $5.  . Really, how do you expect the kind of accuracy that your looking for with the range that scale offers and the lightness of what you are trying to weigh. I hope you guys aren't buying your chemical entertainment weighed out on a set of 6 buck scales. :- ) |
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Post by mrpalmetto on Mar 23, 2015 17:41:16 GMT -5
Really thinking about it. That scale for $5. ranges from .01 to 200 grams, or close to a little less than 1/2 a pound. Do you think there might be a .05 to .09 deviation in the accuracy? You can weigh a 5 gram roller, or a 27 gram bag, which is an ounce, OR nearly 2 full sized sticks of butter. I doubt we're are even going to get close to CONSISTANT accuracy. For $5. . |
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Post by JoeyBee on Mar 23, 2015 17:55:23 GMT -5
Really thinking about it. That scale for $5. ranges from .01 to 200 grams, or close to a little less than 1/2 a pound. Do you think there might be a .05 to .09 deviation in the accuracy? You can weigh a 5 gram roller, or a 27 gram bag, which is an ounce, OR nearly 2 full sized sticks of butter. I doubt we're are even going to get close to CONSISTANT accuracy. For $5. . As for weighing them, yes I left the roller on for a about 10 seconds to ensure the weight wasn't jumping up and down. And I also waited after taking each one off. As for the accuracy, yes it is a cheap scale, but all weights would be off by the same amount and still confirming that every roller is not the same exact weight. Why don't you post the weights of your rollers/sliders with your super accurate scale so we can get some very reliable measurements? |
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Post by geh3333 on Mar 23, 2015 18:28:48 GMT -5
Lol, I like the scales that jump around when nothing is on them . I borrowed a scale from a buddy last week bit it didn't go down into the 10ths of a gram " even though he said it did " . his scale was also 2 grams off . for an 11,gram roller it weighed 9 grams on his scale . even after zeroed in. At least the $6 scale seemed to be very close. I have a $30 scale that seems off at times.
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Post by geh3333 on Mar 23, 2015 18:44:17 GMT -5
Maybe the company that sells the cheaper scale decided to actually charge a few dollars more than what they cost to make ?
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degrees and reweigh them all again, taking time to let the scale zero itself. Unless you have a relatively decent priced scale, you can't expect a great readout that you can bet the farm on, on a scale that costs $5.