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Thread: IH - RF45 bearings

  1. #13
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    Quote Originally Posted by arizonavideo View Post
    What runout did you have before?
    I looked back on my build thread and I can't find that info. I know I measured it but never poasted it and forgot... It's hell to get old!

    Anyway I decided to measure again today with a tool instead of the edge of the holder.

    It looks like .0002 if I turn it by hand but here is a video at 500 rpm.



    Kelly
    www.finescale360.com


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    I would say that the $23.00 bearing was money well spent.

    I often see people buy the high dollar bearings but most of the time a good quality standard bearing give great results.

    When your down to .0002" with a tool holder you are doing quite well.



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    Quote Originally Posted by arizonavideo View Post
    I would say that the $23.00 bearing was money well spent.

    I often see people buy the high dollar bearings but most of the time a good quality standard bearing give great results.

    When your down to .0002" with a tool holder you are doing quite well.
    I am totally agreed with you and i only focus on good quality rather than spending money.

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    AV, so did you use AC bearings for top and bottom or an AC for the bottom and TRB for the top? I don't have a clear picture of what your stating.

    Richard


    Quote Originally Posted by arizonavideo View Post
    I think the preload is stabilized a bit by the fact that the spindle shaft is so long that it stretches a bit under high preload!

    Both of the new bearings are slightly shorter than stock TRB's but the spindle nut will thread on further and almost needs a shim to set preload but should work with no mods.

    I did mine and it was no problem and I found a brass cage USA bearing for $22 that gave .0002" runout.

    I often end up milling deep profiles with larger cutters in steel like a 5/8" x 4" carbide cutter and I don't see the single bearing being a problem, machine flex and tool pullout yes, but not the bearing so far.

    My preload ended up a bit high so I still have a fair amount of heat but no problems so far. Its making about half the heat of the TRB.

    There is two small drilled holes in the lower spindle housing to help you drive out the lower race, they are not real easy to see if you don't look for them. The fit is tighter than really needs to be so clean the seat well or the new race wont seat. The upper race can be driven out by a long screw driver with a bent tip or just a shaft with a bend at the end.

    If you don't go over 6500 RPM much the top bearing could be left in. It is smaller and will do better at high speed than much larger TRB at the big end.

    I bought a spare 7207 Nachi to have sitting around just in case I need to do a quick replacement.

    I think with some luck you could change out the lower bearing in around two hours.

    I don't think there is enough metal in the housing for two bearings and considering how long a single should last and the replacement cost of a spare bearing, keeping a spare around might be just as well.

    I did spend some time looking for a good low cost spindle grease as I have 4 that need re packing. I went with Mobil SHC100 NLGI 2 lithium synthetic.

    It has a similar melt point and thickness as the Kubar NBU 15 and cost about $13 a 13oz tube. McMasters has it.

    "The official grease of NASCAR."

    So far so good on the IH A/C spindle bearings.




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    I changed both to A/C but the top bearing could be left a TRB because it is much smaller and can go 8000 RPM just fine and they are stronger than a A/C bearing. It is a bit thicker too so you might not need to add a shim under the nut to have things fit. The A/C bearings are shorter/ thinner.

    I only changed my top bearing because I knew I would be doing some high speed testing of the belt drive units and I didn't want to run into bearings problems. I don't think its a good idea to run the spindles much over 6500 RPM anyhow.



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    Hi, lots of good information in this thread. I am replacing these two spindle bearings on my IH-RF45 which I acquired 7 years ago. The TRB on this IH are only 14mm and 15mm thick. The replacement A/C bearings are 2mm thicker (16mm and 17mm). My question is do I need to machine both ends to accept these thicker bearings. I am a novice as you might gather from my question. Thanks for any help.

    kent



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    Old post but I am curious if anyone has doubled them up too. Also the very top two of the four deep groove seem to be standard abec 1 quality on all my mills and wondering if anyone upgrades those? Especially given a belt drive conversion it seems abec 3 is the way to go since nothing better is available out there right now in a standard deep groove. Obviously ac bearings won’t work where they can’t be preloaded. I blew a seal on one of my mills so I figured I’d change all the seals and bearings. I might even make my own belt drive if time allows.



    Quote Originally Posted by skray775 View Post
    Hi guys,
    While working with my machine today the lower spindle bearing started to heat up pretty good. I was on borrowed time with the belt conversion running 6500 rpm and stock tapered roller bearings.

    My question is about angular contact bearings for the spindle. It is my understanding that in a perfect world one would have a double set of AC bearings at the bottom of the spindle with a single regular bearing at the top. This eliminate the thermal expansion messing with the pre load I guess.

    So on our less then perfect machines (RF-45 types) do you simply replace the tapered roller bearings with AC bearing (one on top and one on bottom) and get the pre load as close as you can? Or have you guys been machining out the lower spindle for a double set of bearings at the bottom?

    I am looking at:

    7207BMU Nachi Angular Contact Bearing 35x72x17 Brass Cage C3 Japan Ball Bearings... $40.00 each.

    Or

    7207 Nachi Angular Contact Bearing Steel Cage C3 Japan 35x72x17 Ball Bearings... $23.00 each.

    Thank you for your help.




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    Not a bad price for those Nachis. I’m looking at $150/or for AC in a P4 abec 7 grade. Have to buy same pairs so it’s good I have several mills.


    Quote Originally Posted by Uguessedit View Post
    Old post but I am curious if anyone has doubled them up too. Also the very top two of the four deep groove seem to be standard abec 1 quality on all my mills and wondering if anyone upgrades those? Especially given a belt drive conversion it seems abec 3 is the way to go since nothing better is available out there right now in a standard deep groove. Obviously ac bearings won’t work where they can’t be preloaded. I blew a seal on one of my mills so I figured I’d change all the seals and bearings. I might even make my own belt drive if time allows.




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    I have got o know how you used these cheap angular contact bearings. I Do sides Labeled “B” face each other since that is the high lip of race? After installing dry I have .007 run out and I haven’t even ran it yet. I’m a little concerned about using these.




    Quote Originally Posted by skray775 View Post
    Hi guys,
    While working with my machine today the lower spindle bearing started to heat up pretty good. I was on borrowed time with the belt conversion running 6500 rpm and stock tapered roller bearings.

    My question is about angular contact bearings for the spindle. It is my understanding that in a perfect world one would have a double set of AC bearings at the bottom of the spindle with a single regular bearing at the top. This eliminate the thermal expansion messing with the pre load I guess.

    So on our less then perfect machines (RF-45 types) do you simply replace the tapered roller bearings with AC bearing (one on top and one on bottom) and get the pre load as close as you can? Or have you guys been machining out the lower spindle for a double set of bearings at the bottom?

    I am looking at:

    7207BMU Nachi Angular Contact Bearing 35x72x17 Brass Cage C3 Japan Ball Bearings... $40.00 each.

    Or

    7207 Nachi Angular Contact Bearing Steel Cage C3 Japan 35x72x17 Ball Bearings... $23.00 each.

    Thank you for your help.




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