11-14-2017, 09:43 PM
Been at this off and on for a while, have it to the point that there's something worth posting.
Liked the look of the ball turners that use a boring head for the adjusting mechanism. In true not for profit and needed the challenge I decided to build the mechanism from scratch, or in this case cast iron as I was all out of scratch.
Had a piece of scrap cast iron that looked like there might be a tool hiding in it.
Was given a beautiful little boring head from a jig borer. I thought the locking mechanism for the dovetails was elegant so blatantly stole the design.
![[Image: J06IzpDpdwXB-scl_Ey0TwJrDZcCZr99VbWVf-QE...47-h729-no]](https://lh3.googleusercontent.com/J06IzpDpdwXB-scl_Ey0TwJrDZcCZr99VbWVf-QEA8R6HScvwk-4E1fl-g_lqAv_MP6uGGFkIEg_HKov22yLj14DQavrD5xFvrFyekOr6Ej-FjkqK3ETE7l2tEEhT2V0Etys436HFLM-tcwXJD1IvddvGdECDAuKExX8GrHVrBG8yanBM4YUsHFnlnFPx3zm1ypQI4lLxq6F64lWZzkUEcSnlOzxaJgAL86FrqU6vzyF-_HYI1Yb4Z9VeIr5XE_X-NnqosScvoMi8BoghmhTq1sahq1wlIQ6l0VkpnDn4YaWghFvbAqOcMUnlr15hK9Tp8C5SKtP2EVYUyuTNUKZHa9pZi0A3WeT4cdTfAaEsCLou3PJHs88zdnHIYeGqONPIowDKLCdhpGhkK6jgCUpudGFEfhK3kRhyQPbA2oVXG-Urfk70PL4AQDNulpoMICJ1WsGR5JHluxe7bByigxfD2jaHmnQDh5PH8g1B45UlCLcuKhqWnc36Z8fD8C2kJebcQBg2yFFYbzzn-n7exHNhvHj1mi-reYhb_UZYLUAyh8T6UqkLReHbX9Eof3BbCKzbB9EJbMztSreUbfc0WKV_8Fe2hBm9cbA8i510kMnxw=w547-h729-no)
![[Image: 0t_rLuY6aIGQc6R_2Tgqx9V0LqDGcF_SVGXs9mSb...45-h634-no]](https://lh3.googleusercontent.com/0t_rLuY6aIGQc6R_2Tgqx9V0LqDGcF_SVGXs9mSb653RbBrXxPfCeI3lCi1fORlZTq3pEnaBZ0Q4UxEVBck-r59aKsQSKSyRckTMG3MeMRuwv0qkXM51ObcePf73tvzT0l5HTgsJ0QwtFgNM7LDQjF72lMtWTd_uiWoZLfBee3vBuHU_Qet_nIS2gh-VBulYy7lnDLU002QIx9D9HUCVkWQ0r247d_6xNkurr7CNDOJGxhkEHNdFPoZMWPj3kbsaV7uFL0mxUfrv19cJgeHuIrthOCdFQRVmM2DE1LKkalZNu-m7Du-ROlSpRZOEXe9uHGT2h4_dks-QlaWh29ioFEUGuOfj7hR7GZLA4swGViJbnAmHzAxfPps9pWhyGXpMXMg88q4TmE7ceGSP9taeU_IKRqr2RGkhsS6s-8BjwoFg2SD9enXnqSej8nEKN4pcfYaJ3025RB-7OY6_zqshy8lV7MNwKbLWrUYb7b-At46KB_okUXSuaeZodPrZMhb_csUf9eIn27ppkyL74Gjc-BiaTkycvkn7dRJ5-3_PBuBguALZREKAA1EAbKc-taFpshJoNatqujP5djj9SEvsB3DBkOqpsaaVdJ3AoXIIkA=w845-h634-no)
Cheated and cut the dovetails on the mill rather than the shaper, mostly because I need a better vice for it. Interesting note. I cut the male section first using two 3/8 dowels to measure the size as I always do. That went fine. Used .005 shim stock to hold the clamping section open while I cut the female part. The measurement between the dowels that I took off the CAD drawing wasn't even close. Still can't figure where the error is. If I take the distance across the dowels from the male dove tail and subtract the diameter of the two dowels that should be the inside measure, but that doesn't seam to work either. So in true hacker fashion I just snuck up on the fit and it worked.
Liked the look of the ball turners that use a boring head for the adjusting mechanism. In true not for profit and needed the challenge I decided to build the mechanism from scratch, or in this case cast iron as I was all out of scratch.
Had a piece of scrap cast iron that looked like there might be a tool hiding in it.
Was given a beautiful little boring head from a jig borer. I thought the locking mechanism for the dovetails was elegant so blatantly stole the design.
Cheated and cut the dovetails on the mill rather than the shaper, mostly because I need a better vice for it. Interesting note. I cut the male section first using two 3/8 dowels to measure the size as I always do. That went fine. Used .005 shim stock to hold the clamping section open while I cut the female part. The measurement between the dowels that I took off the CAD drawing wasn't even close. Still can't figure where the error is. If I take the distance across the dowels from the male dove tail and subtract the diameter of the two dowels that should be the inside measure, but that doesn't seam to work either. So in true hacker fashion I just snuck up on the fit and it worked.
Free advice is worth exactly what you payed for it.
Greg
Greg