I usually say sharpness of the edge, positive rake for steel that wiill file, and the toolbit/insret angled/set so cutting forces will swing the bit/insert away, not deeper into the part.
One can buy a 12" digital caliper for around $40 and attach it to a mill travel to get a half-thow likes of a DRO. With that, or just rubbing a collet held dowel on the part I could get a spot drill to about .002 close to center.. but still turning the part 180*, and getting the drill to start...
I would not wish to land on the moon in a device that would fall over with hitting a rock.
Pretty soon there will be so much junk on the moon your rocket would likey get a flat tire and you would need to call Earth for a tow truck.
I dont think Verizon has a cell tower there so the call would...
QT: (Scribing lines and center punching is asking for inaccuracies..)
Agree, I figure about .003 if you do a good job of it.
Drilling from each side the hole will not be a line bore throught the part.
Drilling one-shot throught the part will be a little more like a line bore but may wonder and...
QT: carbid Bob Before we all go into the 1001 ways to do this.... what do you have?
One can use the mill's hand wheel numbers to measure pretty close. fudge up a scribe that fits the mill spindle or mill head. put the part with hub horizontal in your mill vise.
Travel down to touch the held...
My fishing buddy Jammie was towing a big barge for Ryba Marine on the Mississippi and the tugs engine quiet. He called authorities ..and then they got it stared.
Putting the holes on the OD of a pulley hub?..if holes are 180* apart.
For about .003 or so you can clamp each to a 123 boock ,then with a JoBlock stack scribe one side then the other with a height gauge scriber, and do a nice job of punching the location. Then bump the vise held part with an...
I used to do that with on B&S 13 grinder with a machine center spinnig on bearings to the centers taper, and cranking with a stack of rubber bands to a Dremel (die grinder) also did live centes that way. often getting <0001"
One time the big shop paid over $8k for a new spindle that showed the...
What is the value of the ship and its cargo? by maritime law that is how much the ship and owners should pay.
That is the law..why is there qoestions about it.
Who gains by the taxpayer footing the bill.
If the bridge lights failed we would pay to repair the ship, trun around is fair play.
Only...
A shame they don’t have an arrow to show what side of the scale is the right one, and they don't usually come in metric.
or are they in metric and imperial is left out?
And how do they work if you are left handed?
The accident is likely our fault for us not giving free college scholarships to China ship crews and captains.
It is a darn shame that other countries students don't get a USA proveded free ride on education.
We could put our house in hock to pay for it.
It might lower the world crime rate if...
We used to sharpen angles to valve seat cutters to .0001 in a 3/8" length with an old cinci #2 Tc grinder.
Drills? likely a 3 flute reamer would be better.
Call Special Drill and Reamer in michigan to desigh and make your cutters.
Often spinning a circle grind to a cutting tool at the inspected...
This website or its third-party tools process personal data (e.g. browsing data or IP addresses) and use cookies or other identifiers, which are necessary for its functioning and required to achieve the purposes illustrated in the cookie policy. To learn more, please refer to the cookie policy. In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise.