(11-14-2018, 08:30 AM)pepi Wrote: Tom,
I understand what you say, the next time I play with this concept I'm going to verify. Have telescope gauges, just arrived. That's a motivator on its own. I did read the round bar after machining, it was + .0005 .(caliper)
Being new to machining for personal projects, was unaware of the known inaccuracy of the caliper.
Thanks for the advise.
Next comes knowing climb and conventional milling, like standing and walking. In other words, not thinking just applying and using at will.
:-)
Pep
Digitals are much better than vernier calipers, AKA verynear from the "Good Old Days", but as Tom said they require correct use, effectively making sure they are square with the work, the pressure applied is consistent, etc. It would be a good idea to compare your caliper & micrometer readings to get an idea of their/your accuracy.
As for climb & conventional milling, imagine yourself above the center of the spindle looking down. Is the cutting edge moving away from the work (conventional), or is it digging into the work (climbing).
Dial calipers were in some ways a step up from verniers, but were easily damaged from trash between the rack & the gear. They could also skip a tooth & be .025" off. One shop I worked in banned them for this reason alone.