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I was wondering if I could use a grinder to make a couple flats or grooves in reamer pilots. Trying to get more oil flow to push out the chips.
The oil pump connects to the muzzle. I figured the oil would push the chips away from the pilot.
System works fine, but more pressure couldn’t hurt.
without buying a whole new oil setup because it isn’t needed. Not looking for “get a bigger pump”.
Retaining coolant flow: A drain hose returns the coolant to the sump.
On the PTG HSS reamers, the pilot shank is too large of a diameter to allow any significant fluting on the pilot bushing. That is why the carbide reamers and reamers set up for oil groove bushings have a small shank.
I only buy carbide reamers now but still have a bunch of HSS reamers. I use water based coolant and used to notch the screw heads to allow more flow. I quit doing that as I don't feel it made enough of a difference. I am using the factory machine pump around 30psi and am not real sure what the flow rate is, it'd probably fill a 5 gallon bucket in a minute or two. With HSS reamers, I run a macro program that progressively takes smaller pecks until the minimum I define. There's lots of time for chip evacuation.
With carbide reamers, I can ream the entire chamber in a single peck. I still program 3-4 pecks to give myself a safety spot to abort if something doesn't sound right.
This video is a HSS reamer with an unmodified screw head. Plenty of flow.
HSS reaming 6CM chamber. - Rubicon Precision, Inc.
Curious as to how you set your z-axis zero depth / what is used as a reference before you start cutting if it's one-shot and done?
Amazing what a guy can do with a bread pan and a hunk of red rubber gasket material.
The hole in the rubber is a snug fit on the reamer shank.
Most chips drop out in the pan. There is a fine screen in the return line to the sump to catch the little chips.
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