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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lothar Walther barrel reviews?
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<blockquote data-quote="Trickymissfit" data-source="post: 877597" data-attributes="member: 25383"><p>there's a guy named Hart over here that makes his barrels out of 17ph-4 (as well as his actions). His barrels and actions seem to win more than their share of the action. There's another little company named Black Star that uses metal like that. </p><p> </p><p>The first time I had a job out of 17ph-4, it was for a dozen gears with an oddball involute. They were about a foot in diameter, and they had a .001" window on everything (involute, spacing, pitch diameter,etc.). I found a cutter that was close and had it reground to a spec provided by Valenite and Ill. Tool. It didn't work as well as we wanted it to, and they had me regrind the tool slightly differently with a different coating. The gears were cut on a Lorenze, and looked like they were gauge quality. Everything was in the .0004" to .0006" area per the Redline. I made each gear with two cuts, a roughing cut that left about six or eight thousandths all the way around, and then programed the shaper for a second cleanup pass. I actually had more trouble cutting the gear blanks than cutting the gear teeth, and that wasn't that much. Just had to change the inserts three or four times to reduce the tool pressure. The hard part was sawing the gear blanks as it ate saw blades like Ampco 22 bronze. Now you think that .001" on a 12" diameter #6 modified pitch gear is a breeze, then try it. I figured that we'd have to run them accross the Magg gear grinder to clean up the involute before we cut the first gear. That's like cutting a rifle chamber to fifty millionths of an inch. Still a piece of cake compared to Hestalloy.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 877597, member: 25383"] there's a guy named Hart over here that makes his barrels out of 17ph-4 (as well as his actions). His barrels and actions seem to win more than their share of the action. There's another little company named Black Star that uses metal like that. The first time I had a job out of 17ph-4, it was for a dozen gears with an oddball involute. They were about a foot in diameter, and they had a .001" window on everything (involute, spacing, pitch diameter,etc.). I found a cutter that was close and had it reground to a spec provided by Valenite and Ill. Tool. It didn't work as well as we wanted it to, and they had me regrind the tool slightly differently with a different coating. The gears were cut on a Lorenze, and looked like they were gauge quality. Everything was in the .0004" to .0006" area per the Redline. I made each gear with two cuts, a roughing cut that left about six or eight thousandths all the way around, and then programed the shaper for a second cleanup pass. I actually had more trouble cutting the gear blanks than cutting the gear teeth, and that wasn't that much. Just had to change the inserts three or four times to reduce the tool pressure. The hard part was sawing the gear blanks as it ate saw blades like Ampco 22 bronze. Now you think that .001" on a 12" diameter #6 modified pitch gear is a breeze, then try it. I figured that we'd have to run them accross the Magg gear grinder to clean up the involute before we cut the first gear. That's like cutting a rifle chamber to fifty millionths of an inch. Still a piece of cake compared to Hestalloy. gary [/QUOTE]
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Lothar Walther barrel reviews?
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