Re: Where to buy a 1/8" diameter test bar for measuring TIR on a CNC ER8 spindle?
hy white, i don't know exact sources for seeling such stuff, but they exist
however, you may craft your own; it does not matter if you have 1,2, or you just crafted them; is all about how you quality check :
... the test bar
... the spindle
... the test bar inside the spindle
for example : what tir did you noticed inside the spindle ? how much of it comes from your test bar alone ? if you can't control those, you may end up on a buying spree
test bars have to be made from stable dimensional material over time, heat treat, not rushed machining, transported without shock, and keeped in conservative package; i prreffer to craft them, considering that most things nowadays are low quality
Well, suppose I did that, and suppose that when I measure the TIR, it comes out too high. To what should I attribute the high TIR?
if you are lucky, maybe you will notice low tir with a new test bar
if you can't find one, you may ask for such a thing at a local tool/gauge manufacturer in your area / kindly
Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg