Anybody try 3d milling a slug mold?

[Spike_9]

Will do. I wanted to try working out my design first. I cut a new mold for the slug above and tried them out today. They grouped WAY BETTER. No Key holing! The target below is 8 shots. I weighed them and they ranged between 15.5 to 15.9 grains and the OD is .177. I didn't resize any. I was shooting off of a field pod with a scope that wont focus under 25 yards so the target is blurry. 

 

[Raider03]

Nice improvement! How fast are those slugs flying?

 

[Spike_9]

Nice improvement! How fast are those slugs flying?

Thanks! They are going 850 out of my P35 with a 18.5" CZ barrel. I want to adapt a FX slug liner in 177 to test them in when I can find one in stock. The extra length should help push them faster. 

 

[shotmaniac]

Thanks! They are going 850 out of my P35 with a 18.5" CZ barrel. I want to adapt a FX slug liner in 177 to test them in when I can find one in stock. The extra length should help push them faster.

i have not seen if you mentioned it but how good a cnc you need to mill these(aluminum?) moulds?

 

[Spike_9]

i have not seen if you mentioned it but how good a cnc you need to mill these(aluminum?) moulds?

For 3d milling, a mill that can hold >.0002 tolerance would be best. I am shelving the 177 moulds for now and focus the design on larger calibers. I made a proper spur plate and found that it was deforming the slug in the mould as I was trimming off the excess on the base. I will instead venture off into swagging my own designs.

 

[shotmaniac]

For 3d milling, a mill that can hold >.0002 tolerance would be best. I am shelving the 177 moulds for now and focus the design on larger calibers. I made a proper spur plate and found that it was deforming the slug in the mould as I was trimming off the excess on the base. I will instead venture off into swagging my own designs.

idk what is a spur plate, i was thinking a mpcnc or dremel cnc what do you think? i have a board, printer, belts, dremel and part of the frame already


from youtube videos it mills aluminum fine, the dremel one leaves the surface rougher which i think is a potential issue for doing moulds

 

[Spike_9]

idk what is a spur plate, i was thinking a mpcnc or dremel cnc what do you think? i have a board, printer, belts, dremel and part of the frame already


from youtube videos it mills aluminum fine, the dremel one leaves the surface rougher which i think is a potential issue for doing moulds

Oh I misunderstood what you were asking. Your setup will not work because they severely lack the rigidity and accuracy to do precision work. You would be better to make a form cutter on a lathe and mill the halves. I wanted to go the rapid prototyping path that would allow quick design changes.