10-30-2018, 09:59 PM
Will have to fire the boiler with nitros Tom to get the benefit of the steel crank.
Made a jig that the crank fit with a light press fit, this put the throw with a 5/8s offset on the center line of the lathe. Used an aluminum lap to bring it to final size. Then machined the ends, couldn't get a nice finish so took the last thou off with a file and emery paper and lapped to final dimension.
![[Image: D7wuIPB8RhP3HgDK2iy9UqjkPB49BX-ulVJKzefP...8-h1191-no]](https://lh3.googleusercontent.com/D7wuIPB8RhP3HgDK2iy9UqjkPB49BX-ulVJKzefPPeSmybXSowCRFIUpTMHtmriAvbFoPFCxPmAkpyRKqHOAz-XnP1Mg-yuEq0Rw1YCQEp4B15U9oXCF1cumWeq1cyWJ7NSJ6KfRUuzZHNFJRRG6fXtSFZETuvP6giyOg4cwRZIh0TAYq4uvZSllabFOLyhmjMDk8WacTqs5Xb4JFhIdnBbqKXpZpDgeWZUMMT2bXVcq-olWg4ZTtZBE9qwVhsXXVXZisExyEusEQKF1nn8-uFjiKv0pim5E6l1OhMw7uzSY7-gEHzqWkWNk8dwx9KnMjHgr2IPcFUOEurLllDCC68BsBmI7KqnYDrzB1myjP5zHC8ss1JmpkV7bpiDf3GrSEkFs0zclh-6UuDAFbMa066Nir8RLX_sPvbHNa2cNrC8iE8064EagKwoZ3fxeyFCFguQ3r2nvILOA5e-gruCsImDaOcKQOu6XzIpxWnp_-AVDv1L_uoRZg5opubaKs5zdIzUnarPznvF1ETp_10T9f1xJely9Ycb11KeaVwkx44HRmYUiAG6bVJtJ3EII1biYJ7uMTLRfVk-0C4XLobJMCgVezvicatloDVyS6kkb3fgtOm9o6V_OT3ay88ONywzbM0JhXnr-h5HwyYIJ1jm2tvg8=w1588-h1191-no)
I clamped a piece of scrap to the mill table then drilled and reamed to 3/8ths to match the dowel pin in the bearings. With a collet in the spindle I positioned the crank case using the dowel pin between the collet and the reamed hole. Then brought an angle plate up against it and clamped. Drilled and remed to final size.
![[Image: jsWBZetrhPeCcPF9wyrcshGZaHhxz9Kk9z2KXC7a...8-h1191-no]](https://lh3.googleusercontent.com/jsWBZetrhPeCcPF9wyrcshGZaHhxz9Kk9z2KXC7axtfCx-vY7TsNaHI19LJNrNqzRG4C1EOh4Gbn1XOkg8kcq6a9QqGx2bICURbp9-p0FvHWL1aDFihiCXPvliO7mzP7rraoyFgc2paMYnbZxwFuzKSJnX7XF5B2sNYbBdSJAqS9MoFFpTKu6uFdZBQFTMK_7Dh3qdagJXJLQRJRWb87VA80KXm9UJ_nPz9nGTUzSU512I5I2cQhtWf5rgYld6ZfqX0BltlVGe9z8Lqi_9Qk_lEhbX5EBDWMB5Koo_KSqb0rHSxbDAwIY_jhQRzte2ZBckwsD0ZT9Ysy2kiFsXPL43CVcn-nVEuAuAYAiaV0Cv5RLiS4gVHHA2zbwP1BByDNN7M8y94BH8ajc2L9p3vENU2KtVwayY3z8-P9j3z3fJDlouDIt6xIGpIYzSw_BT1XnjGcIHvRWG5a_IEEFv9UtfyO6vaBu-XM_Aa5dVhTDi2I9QSvfrA05IbOVTnubL4W7SpIVvQXsh2qgXrrq8eWUAqNJGuxyC4-0LMTKWYoTZa743STK3e_8ASSuQ4lO4Tx05RSNC18z8Dq0m09v7AUcmKHs2o8ykDOiCKGYb36oUV401zUB2q-qkDtfisalu6BTiF2RVvHcGkqrRe4I1KlX1-A=w1588-h1191-no)
Had a 1 thou over reamer and lapped the shafts to 2 ths under, giving me 0.0012 clearance, (If the caps are perfectly aligned) Will that give enough room for oil?
![[Image: _t0s_EvWF1UzzfpjXM5pY5f9D9rjc3hBbNK7o9xx...8-h1191-no]](https://lh3.googleusercontent.com/_t0s_EvWF1UzzfpjXM5pY5f9D9rjc3hBbNK7o9xxQBhq-AAIeg7TqoMA9gX8T3-aDnGQPB0NyPVIehx-hxSYflHrxEi3YqjVDwQ6SSKIa-uyhQmQmVcTZwn_gMLnhyBbwosvOpYV6_mMjDwf3sHeSpI5hj-4uWHi_WB2_UYlPBxJGncuTpH0zrRiocCW_q1Sj1MzsV7P0G4JhBeoyNzS11RZTnjdQdkNQnuCLTrsyOV5hezELec_kOENFpVlcz0_s70lr62mNYVN8-vpCjn1kyEWX7Em0pcLbFrQ6Imndc-MwKP-p4ckJ4vSQxlvh6at6zsckUSNZ3_h4cS89m0CBUmPJyNCRME0XadNR8GAWJLTfqATQhHOeVOH-42TcD8jgX4m9QoIMDIIDUkCXmRiyNRFFd2BQXgXzJglXANcMVhRccvONuDDYGJnalnMnIGVE7vJLb2scACaJRl7O23VuQ4bymLt3Hu0xGZPyVdNhmWFcXaR9nYoAd_1MVFfGeGn1m8GKB5yEXRUN4EVWLltNbZvU9rIjBm2S5S_8MC_WkjxTJ_irqD_zhulkGFVb9x5mAPoN10aaWToPfpBcVDpBQSmsgb2X2rcEPB8JN_7uRmeLTnsoe3O3toGGv463T861QrZL_BSymRXHdkmV9sfgcGA=w1588-h1191-no)
Made a jig that the crank fit with a light press fit, this put the throw with a 5/8s offset on the center line of the lathe. Used an aluminum lap to bring it to final size. Then machined the ends, couldn't get a nice finish so took the last thou off with a file and emery paper and lapped to final dimension.
I clamped a piece of scrap to the mill table then drilled and reamed to 3/8ths to match the dowel pin in the bearings. With a collet in the spindle I positioned the crank case using the dowel pin between the collet and the reamed hole. Then brought an angle plate up against it and clamped. Drilled and remed to final size.
Had a 1 thou over reamer and lapped the shafts to 2 ths under, giving me 0.0012 clearance, (If the caps are perfectly aligned) Will that give enough room for oil?
Free advice is worth exactly what you payed for it.
Greg
Greg