anti galling tips..on ss to ss press fit
anti galling tips..on ss to ss press fit
(OP)
I am looking for some help. Here are the conditions.
I start with sa-182 (sometimes 479) 304ss or 316ss bar.
-drill and ream a 1/4" hole through.
-insert precision ground rod into hole with 0.0000" to 0.0001" total clearance. requires moderate hammer hits to insert.
-finish machine surface perpendicular to rod/hole
-remove pin in direction away from machined surface with slide hammer
When rod is removed I am looking to achieve a burr free very sharp hole edge in addition to no galling on the way in or out. Ive used 304 to 304 and graphite powder and had slight to moderate gallin on the i.d. of the hole and rod.
-Suggestion for rod material that i can use to both avoid galling under this condition yet maintain like machinability so i have a burr free..very sharp hole left when i pull the rod out.
-lubrication suggestion for this condition?
I appreciate any help..thank you..
I start with sa-182 (sometimes 479) 304ss or 316ss bar.
-drill and ream a 1/4" hole through.
-insert precision ground rod into hole with 0.0000" to 0.0001" total clearance. requires moderate hammer hits to insert.
-finish machine surface perpendicular to rod/hole
-remove pin in direction away from machined surface with slide hammer
When rod is removed I am looking to achieve a burr free very sharp hole edge in addition to no galling on the way in or out. Ive used 304 to 304 and graphite powder and had slight to moderate gallin on the i.d. of the hole and rod.
-Suggestion for rod material that i can use to both avoid galling under this condition yet maintain like machinability so i have a burr free..very sharp hole left when i pull the rod out.
-lubrication suggestion for this condition?
I appreciate any help..thank you..





RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
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Plymouth Tube
RE: anti galling tips..on ss to ss press fit
On some of the tougher alloys we will plate the broach with a flash coat of Copper, a mono- molecular layer for lubrication.
Another approach we will use at times is use a diamond or helical hone on the bore. Either one will true the hole and not leave a burr.
http://www.helicallap.com/
http://www.engis.com/products/honing/
RE: anti galling tips..on ss to ss press fit
-non stainless hard material is an easy fix to avoid galling but then my concern is the metal machining differently disturbing the overal sharpness of the hole edge once the pin is pulled.
Unclesyd
-I am not sure i understand your teardrop approach. Could you explain this further? As for surface finish i am just looking for 8 microinch or so.
Looking for rod / lube combo to achieve no galling vs. like machinability balance.
RE: anti galling tips..on ss to ss press fit
We use the flash Copper on the broach as a lubricant, 2-3 broaching operations without and 40-50 holes with the Copper plate.
I still think the Helical lap will give you your hole.
RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
RE: anti galling tips..on ss to ss press fit
pin is +0/-0.0002
RE: anti galling tips..on ss to ss press fit
How deep is the reamed hole?