Re: MLA Crossslide
开云体育Here is a very technical article on tool life between aged and non-aged CI. Bottom line is aged cast Iron extend the machine tool life. ? Al ? ? ? From: [email protected] <[email protected]> On Behalf Of eddie.draper@... via groups.io
Sent: Friday, September 20, 2024 8:04 AM To: [email protected] Subject: Re: [SouthBendLathe] MLA Crossslide ? I imagine that stress relieved where necesary actually means where appropriate.? Castings for the slides, yes, castings for a handle, no. ? As an aside, I have never understood how aging at ambient temperature releases any part of locked in stresses created as a result of differential temperatures during the cooling of a casting.? I would have thought it would be necessary to apply external loads so that areas with a high residual tensile stress were forced to yield somewhat.? After all, that is what results in the deflections seen in service on castings or fabrications that have not been properly stress relieved at birth. ? ? ? ? ? -------- Original message -------- From: "ww_big_al via groups.io" <arknack@...> Date: 20/09/2024 12:14 (GMT+00:00) Subject: Re: [SouthBendLathe] MLA Crossslide ? I purchased one of their kit several years ago. That project is still on my never ending to-do list.? The casting is well done. Stress relieved means it has been heated after casting to relieve the internal pressures so it wont warp after machining. In the old days, they would let the parts age a year or more to relieve the stresses. |
ww_big_al