BuffaloBill
Silver $$ Contributor
I may not be up to speed on all the available bench-mounted priming tools.
Some advertise adjustable seating depth but look like they index off the upper edge of the rim. I do see the Primal Right’s Rimlock accessory for their CPS, that’s said to index off the base of the case. I have not handled one, but it doesn’t look very quick to use. Maybe I’m not fully understanding what I see in pictures.
But with that same goal in mind, and just thinking out loud here, what do you think of this design concept?
What if the shell holder was in the form of a rectangular steel plate. Below said plate would be an electro magnet, like used on magnetic chucks. The shell holder plate would be dimensioned such that it could clamp the thinnest rim against the priming pedestal.
When the priming lever is swept through the beginning of its travel, a switch would energize the magnet, clamping the case’s base against the pedestal.
Does anyone have data on what force is needed to press stubborn primers into tight primer pockets?
The magnet would have much more holding force when the plate contacts the magnet. With a rim thickness on the upper end, the resulting gap between plate and magnet would lessen the clamping force. I’m wondering if the plate were made to flex against the magnet, if it would be stiff enough to hold position during primer seating? I see electro magnets having 300-600lb holding force. I picture two magnets, one on each side of the central priming mechanism, or one having a hole in the middle, etc.
Some priming tools are quite expensive already and this wouldn’t make them any cheaper……. But it could be a fun project. To date I’ve seated all primers by feel with handheld or the inexpensive Lee bench tool, and it’s been working fine. I just thought a premium tool that seats to a specific depth, indexing off the base, could be made with a convenient/quick way to clamp cases.
Bill
Some advertise adjustable seating depth but look like they index off the upper edge of the rim. I do see the Primal Right’s Rimlock accessory for their CPS, that’s said to index off the base of the case. I have not handled one, but it doesn’t look very quick to use. Maybe I’m not fully understanding what I see in pictures.
But with that same goal in mind, and just thinking out loud here, what do you think of this design concept?
What if the shell holder was in the form of a rectangular steel plate. Below said plate would be an electro magnet, like used on magnetic chucks. The shell holder plate would be dimensioned such that it could clamp the thinnest rim against the priming pedestal.
When the priming lever is swept through the beginning of its travel, a switch would energize the magnet, clamping the case’s base against the pedestal.
Does anyone have data on what force is needed to press stubborn primers into tight primer pockets?
The magnet would have much more holding force when the plate contacts the magnet. With a rim thickness on the upper end, the resulting gap between plate and magnet would lessen the clamping force. I’m wondering if the plate were made to flex against the magnet, if it would be stiff enough to hold position during primer seating? I see electro magnets having 300-600lb holding force. I picture two magnets, one on each side of the central priming mechanism, or one having a hole in the middle, etc.
Some priming tools are quite expensive already and this wouldn’t make them any cheaper……. But it could be a fun project. To date I’ve seated all primers by feel with handheld or the inexpensive Lee bench tool, and it’s been working fine. I just thought a premium tool that seats to a specific depth, indexing off the base, could be made with a convenient/quick way to clamp cases.
Bill
