Hey Rich, Just out of curiosity, how's your job going on? you did it? Could you tell me how? thank you in advance

Hi Rich, I am doing a lot of boring of 2"--4" dia (+-0.001)on mild steel. From my experience it's very difficlut and expensive to hold that tolerance (+0.0005-0) to use a twin boring head as a finisher. In my opinion you have to grind them to the required tolerance after machining.

What kind of motherboard are you using? Looks like you need to update some drivers for your motherdoard.

Yea,very cool. tell me how long it is and its diameter,what material you are cutting and RPM, DOC & WOC

Hi, Peter and Mold100, thanks for your helpful replies. The boring bar is indeed longer than necessary, but it is the only one that I have. We produce these parts in high volume, so a faster way is needed, that’s why we are using a boring bar. The material is QT100 ASTM, part thickness is 1 inch, RPM around 950, feedrate is 8inches per minute. First thing we flamecut a hole of 2 inches in diameter, then open it up to 2.18 inches with +/-.010 tolerance by a boring bar. After flamecut the material is hardened a lot.

Hi everybody there, I visit this forum from time to time and today I need some help. I am running production right now. What I work on is mild steel. The part is quite simple: you make a 2” bore with plus minus ten thousandths tolerance, two taps and mill an edge. The boring bar has two inserts: one for roughing, the other for finishing. The problem is that boring is not stable, I mean the tool life for the inserts is very short and varies a lot, sometimes you can get ten parts from one insert and sometimes you get one or two. Whatever you do with the feed rate and RPM, things are still the same. I know the spindle is not good. If you hold the tool that is on the spindle and push and pull it you can feel it plays. I ask my boss to have it fixed, for some reason he can’t. Thanks in advance