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Thread: Harrison M250 Carriage Stop
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19th Jun 2019, 09:29 AM #1Golden Member
- Join Date
- Apr 2009
- Location
- Kingswood
- Posts
- 930
Harrison M250 Carriage Stop
The stop body is CI, the balance black steel and 1214.
The body was originally a TAFE offcut of 75 x 75 mm extruded bar, squared in the lathe, bandsaw to divide.
The adjustable stud is 12x1 mm thread with 20 mm length in contact.
The graduations were done in the lathe fitted with spindle dividing plate and a triangular tip racked by the carriage - 10 divisions give 0.1 mm/div.
One division is 3 adjacent strokes to mark one revolution (=1 mm).
The setting block was made initially as accurately as possible, the body clamped in the vertical mill vise with the block and the prismatic surfaces fly-cut in the vertical mill.
When tested, the angle was slightly large, measured with feeler gauges and one surface re-done with an appropriate packer on the setting block.
The fiducial mark was a centre drill tip in the vertical mill.
The stud nut is a bit of hex bar glued on, the nut some round bar with scallops on the vertical mill.
John
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