16" SB 48 tooth Spur Gear
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  1. #1
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    Default 16" SB 48 tooth Spur Gear

    Need a 48 tooth spur gear (Part Number PT612K48FH4) for my 16" SB lathe. Does anyone have one for sale or better yet have the dimensions (OD and DP) so that I can make one? This gear is needed to thread coarse threads. Thanks in advance for any assistance.

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    I would post pics and location of the gear. Most won't know or look up part numbers.

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    The gear I'm looking for is part 106 on the attached picture.sb_form909d_1_-custom-1-.jpg

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    you should be able to work out OD and DP from the 24t (?) stud gear that's on there. DP = (no. teeth + 2)/ OD. So for my SB9, 48t stud gear is 2.775", so DP = (48+2)/ 2.775 = 18.

    Once you've figured out DP, then OD = (no. teeth + 2)/ DP. So for a 24t gear for my lathe, that would be (24+2)/18 = 1.444".

    The other critical dims are width of gear, bore diameter and key way width. You might get lucky and find a close enough equivalent from Boston Gear or ebay - say one that needs boring out (or sleeving) to fit.

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    Well no idea where it came from, but I have a spare. Looks to be in reasonable shape. I don't need a spare for this gear...........

    PM me and lets see if we can work something out.

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    Quote Originally Posted by Robert Lark View Post
    The gear I'm looking for is part 106 on the attached picture.sb_form909d_1_-custom-1-.jpg
    That's the stud gear off reverse tumbler. The one I have mounted is 18 tooth.

  7. #7
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    The 48 tooth for the double tumbler. Note it says 4 1/8 dia, which works out to 12 DP. (actual O.D. will be nearer 4.16)

    South Bend 16" Lathe Banjo Bracket 48 Tooth Gear (Dual Tumbler Gear Box Only) | eBay

    have fun

    You could see if your 24 is 2.166" OD

    You can plainly see here 24 and 48 tooth stud gears are used

    chart-dt-16.jpg
    Last edited by johnoder; 11-26-2020 at 04:37 PM.

  8. Likes texasgunsmith liked this post

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