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Fondle his Baer
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Discussion Starter #1
So I have a few old slides that are junk which I am testing on. Cleaned up one side of the factory serrations then tested. Currently running my Mill at 25* with a 3/8” 6flute carbide @1300rpm. Gave good results but I’m looking for the math after playing. Anyone know of a video whichexplains depth/angle and spacing?

I got close to the results I wanted from .040 deep and .100 spacing but will need to move a tad closer. Rail cut measured .0775 so have .0375 in the web.

also would like to have the bottom of the slide at the Thumb safety flat like on the 10-8 India gun. What cutter did Hilton use? Was thinking a double angle shank cutter.
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Fondle his Baer
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330 Posts
Discussion Starter #3
Thank you Chuck, Springfield use very similar specs?

found this video after a bit of searching. I’ll just told my Mill but good info.
 

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From the looks of the finish of your serrations your cutting speed needs to be increased. At 1300 RPM you are just above the speed for HSS end mills. 3000 RPM should give better results as well as fewer flutes. 2-4 would be better. If you get chatter you have a setup issue.
 

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Fondle his Baer
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Discussion Starter #6
From the looks of the finish of your serrations your cutting speed needs to be increased. At 1300 RPM you are just above the speed for HSS end mills. 3000 RPM should give better results as well as fewer flutes. 2-4 would be better. If you get chatter you have a setup issue.
no chatter. I did not do a finish cut. I’ll leave a few thou to finish cut when I figure out the math. Would increase RPM but need to rewire my home garage for 230. 115 does not like high RPMs.
Index 645 mill 9x46. Original motor.
 

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Video does a nice simple job of explaining the process.
I sucked at Trig, Glad there's apps for that!!! LOL
 

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no chatter. I did not do a finish cut. I’ll leave a few thou to finish cut when I figure out the math. Would increase RPM but need to rewire my home garage for 230. 115 does not like high RPMs.
Index 645 mill 9x46. Original motor.
At 1300 RPM your running 127 SFM which should be OK for carbide but to high for HSS in my opinion. Uncoated 4 flute or even 3 flute if you can find it, I might know a guy ;), would probably work better. My guess is a 6 flute cutter is probably coated with AlTiN which could be counter productive.
 

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At 1300 RPM your running 127 SFM which should be OK for carbide but to high for HSS in my opinion. Uncoated 4 flute or even 3 flute if you can find it, I might know a guy ;), would probably work better. My guess is a 6 flute cutter is probably coated with AlTiN which could be counter productive.
I concur with @Slapshot.
My earlier recommendation I did not consider the hardness. Typically slides are in the 38-42 Rc range.
 

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Fondle his Baer
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330 Posts
Discussion Starter #10
I have a bunch of Carbide endmills, 1/2” and under. 2-7 flute so will try some others out. Also just bought a Harig 612 for super cheap, pick it up on Friday.
 
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