MATHEWS CAM BEARING ISSUES

Supranatural

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Oct 21, 2020
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I’ve had 2 sets of cams replace by Lancaster Archery after the bearings went bad on my VXR28. Their tech replaced it so it’s either 1) a problem with cheap bearings, or 2) trained techs don’t know how to install the cams. Personally I think it’s cheap bearings, each set lasted about 7000 shots (6 months worth of shooting). I think next time I’ll just replace the bearings instead of having the bow down for 10 days.
 

BBob

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Right on, thank you!
I don't get a warm and fuzzy on the quality of those. Seems to be a generic brand which says china to me. I think I'd seek out a name brand like Koyo, NTN, SNR or the like. The R4-2RS has to be one of the most common bearings ever so you should be able to source them easily. If you have a local bearing house or a Kaman or Motion Industries they all should be able to easily get them for you. McMaster shipped Koyo's the last time I ordered some from them.
 

krisn416

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I don't get a warm and fuzzy on the quality of those. Seems to be a generic brand which says china to me. I think I'd seek out a name brand like Koyo, NTN, SNR or the like. The R4-2RS has to be one of the most common bearings ever so you should be able to source them easily. If you have a local bearing house or a Kaman or Motion Industries they all should be able to easily get them for you. McMaster shipped Koyo's the last time I ordered some from them.
That’s super helpful. So that R4-2RS is the same across brands? I don’t know how to word it, but kind of like an RJ-45 connector is made by different companies?
 

BBob

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That’s super helpful. So that R4-2RS is the same across brands? I don’t know how to word it, but kind of like an RJ-45 connector is made by different companies?
Absolutely, an R4-2RS designation is a standard bearing number found in all kinds of small assembly's and is the same dimensions across the board. You may find it listed as an R4-EE as well and that is the same thing. 2RS and EE both designate a double sealed bearing and is manufacturer dependent but are equally the same. In fact your bearing person will likely verify if you want a double seal or you could tell them you want a double seal to make sure.
 

krisn416

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Absolutely, an R4-2RS designation is a standard bearing number found in all kinds of small assembly's and is the same dimensions across the board. You may find it listed as an R4-EE as well and that is the same thing. 2RS and EE both designate a double sealed bearing and is manufacturer dependent but are equally the same. In fact your bearing person will likely verify if you want a double seal or you could tell them you want a double seal to make sure.
Super helpful, thank you!
 

BBob

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You're looking at a tolerance difference of 0.000157" (4 microns) from ABEC 5 to ABEC 1. I'd be fine with the NSK myself. I don't see the need for a high speed spindle type bearing for this application. If you got anything extra out of them I wouldn't think it'd be much but I wouldn't really know unless I tried.

But I see they want more $$$ for the NSK which is the ABEC 1 bearing. BOCA? I know nothing about them.

McMaster wants $7.72 for them right now. As I said previously they shipped Koyo on my last order. You can call them and ask what they would currently ship.

 
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krisn416

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You're looking at a tolerance difference of 0.000157" (4 microns) from ABEC 5 to ABEC 1. I'd be fine with the NSK myself. I don't see the need for a high speed spindle type bearing for this application. If you got anything extra out of them I wouldn't think it'd be much but I wouldn't really know unless I tried.

But I see they want more $$$ for the NSK which is the ABEC 1 bearing. BOCA? Know nothing about them.
Ok thanks, I know nothing about any of them so going solely off your guidance and what I can find and confirm is Japanese made online lol. I appreciate it!
 

krisn416

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Those NSK's you found are overpriced.
How about these https://www.vxb.com/R4-2RS-Nachi-Bearing-Sealed-Japan-1-4-x5-8-x0-196-p/kit13696.htm ? The thing that’s hard, even the “Japanese” manufacturers have plants in China making them. I found a good deal on a set of SNR brand for $25 but they’re made in France I guess. At this price point it’s really not much difference cost-wise, I just want to get some good quality ones and only do the work once.

I could either find a better deal on the NSK, get the Nachi, or get the SNR. That’s about all I can find and confirm the brand and country of manufacture on. Although NSK if I remember had something about Chinese plants.
 
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