Roughness Comparison Specimens
Posted: Fri Oct 18, 2013 7:05 pm
In one of the current topics "engine failure update" I made a small contribution about Surface Finish of the Cylinder Head.
That evening I had a flash back to my 5 years as a Student Apprentice of which 3 years was in a Machine Shop. Hope there's no shrinks reading this.
At that moment of time I had "hands on" with Drilling, Milling and Turning machines.
Surface measurement was done by Roughness Comparison Specimens and instead of going to the tool stores to withdraw the gauge I purchased my own and I still have it today as shown in the photo.
Although it states "Turning" it could also be used for certain types of Milling e.g. Fly cutting and slab milling. i.e. the milling technique as applied to machining the Twink cylinder head.
You used your finger nail to run across the machined surface and then the Comparison Specimens to compare and it worked very well.
How very different to today's Inspection / surface measurement equipment.
Any others remember the Roughness Comparison Specimens, were really not that old, are we.
OK OK I have now woken up and returned to the day job of being retired.
PS. Is anyone else having problems with the Smilies and putting photos in line?
That evening I had a flash back to my 5 years as a Student Apprentice of which 3 years was in a Machine Shop. Hope there's no shrinks reading this.
At that moment of time I had "hands on" with Drilling, Milling and Turning machines.
Surface measurement was done by Roughness Comparison Specimens and instead of going to the tool stores to withdraw the gauge I purchased my own and I still have it today as shown in the photo.
Although it states "Turning" it could also be used for certain types of Milling e.g. Fly cutting and slab milling. i.e. the milling technique as applied to machining the Twink cylinder head.
You used your finger nail to run across the machined surface and then the Comparison Specimens to compare and it worked very well.
How very different to today's Inspection / surface measurement equipment.
Any others remember the Roughness Comparison Specimens, were really not that old, are we.
OK OK I have now woken up and returned to the day job of being retired.
PS. Is anyone else having problems with the Smilies and putting photos in line?