MWF FEED
29th October 2020, 01:40 PM
Got hold of a portable hardness tester and went for a look-see at some of me old lathes.
As the tester works in the vertical I did the testing on the flat part where the tail stock runs on the ways of the V way machines. Due to the wear on the machines not giving a true flat I did multiples of the 5 ping averages - so at best a ball park figure. Note: the flats may not have gotten the same hardening as that of the V ways.
Not knowing much about what the hardness tester read-out were saying, re them HLD’s, and to give a comparison I could relate to, I took a reading of a Taiwan built Hare and Forbes lathe and a 600 Co Taiwan Colchester to give me-self a baseline. Both lathes gave a reading of 755.
1930’s South Bend: 535
Colchester Student: 765
Early Hercus: 530
Hercus 260: 725
1890’s Smellie and Co: 535
Mars: 550
Rexman: 460
Advance: 490
.
Read the full thread at metalworkforums.com... (https://metalworkforums.com/showthread.php?t=205848&goto=newpost)
As the tester works in the vertical I did the testing on the flat part where the tail stock runs on the ways of the V way machines. Due to the wear on the machines not giving a true flat I did multiples of the 5 ping averages - so at best a ball park figure. Note: the flats may not have gotten the same hardening as that of the V ways.
Not knowing much about what the hardness tester read-out were saying, re them HLD’s, and to give a comparison I could relate to, I took a reading of a Taiwan built Hare and Forbes lathe and a 600 Co Taiwan Colchester to give me-self a baseline. Both lathes gave a reading of 755.
1930’s South Bend: 535
Colchester Student: 765
Early Hercus: 530
Hercus 260: 725
1890’s Smellie and Co: 535
Mars: 550
Rexman: 460
Advance: 490
.
Read the full thread at metalworkforums.com... (https://metalworkforums.com/showthread.php?t=205848&goto=newpost)