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projects:bridgeport [2018/03/25 22:03] – [Lubrication] enlethprojects:bridgeport [2020/01/07 00:01] – [Spindle transmission] enleth
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 ====== Technical specifications ====== ====== Technical specifications ======
 +===== Spindle bearings ====
 +
 +Main bearings: currently NSK 7207CTRDULP4Y. Previously FAFNIR 207.
 +
 +Suitable NSK part numbers match ''^7207C(TR|TYN)D(U|B)(L|M)P4(|Y)$''
 +
 +If replacement is needed, the requirements are:
 +  * 35x72x17mm (7207)
 +  * angular contact bearings, 15deg contact angle (C)
 +  * any cage material suitable for spindles (TR, TYN, possibly some other options, see NSK designation guides)
 +  * matched pair (D)
 +  * universal or back-to-back arrangement (U, B)
 +  * low or medium preload (L, M)
 +  * ABEC7 or ISO P4 rating, those two are equivalent (P4)
 +  * "special precision" is fine but not important (Y)
 +
 +
 ===== Spindle transmission ===== ===== Spindle transmission =====
   * Minimum center distance - motor shaft to driven shaft: 244.5mm   * Minimum center distance - motor shaft to driven shaft: 244.5mm

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