shedhappens
14th May 2019, 05:35 PM
G/day metal heads.
When you are putting a piece of stock in the 4 jaw chuck sometimes you might use a ruler and eyeball it across the jaws or maybe you just eyeball the rings on the face of the chuck in relation to the chuck jaws, sometimes you might get the bar stock close to centre but more often than not when you put your dial indicator on the bar stock it takes on the appearance of a clock on a time machine.
Using a ruler with a strategically placed 90 deg bend will place your bar stock (or pipe or whatever you are putting in the chuck) very close to centre in only a few seconds.
I seem to usually get within .010" to .030" from centre when nobody is watching and I am nearly blind as a bat.
I found the appropriate place to bend the ruler by dialing in a 40 mm dia piece of stock just tight enough that I could grab the stock and slide it out of the chuck by hand. You can use any diameter you like but just remember to set the ruler measurement to the radius of your stock.
Then placed the ruler on the jaw at the 9 o'clock position and aligned the 20 mm (for 40mm stock) line on the ruler with the chamfer at the outer edge of the chuck and then used a small square placed on the underside of the jaw with the blade of the square pointing up and against the face of the jaw and noted the measurement on the ruler to place the bend, soz, no pics of this but if anyone does not understand then I will do a pic.
You might have to tweak the bend a bit to get it right.
In use you set 2 jaws 90 deg apart to the radius of the bar stock, for example 50 mm dia bar stock you adjust the rule/jaw to 25 mm. For 60 mm dia set it to 30mm.
After you have adjusted the second jaw you rotate that jaw down and sit your stock against the 2 adjusted jaws and then nip up the remaining 2 jaws then indicate and do your final adjustments.
I have not done it yet but I think this method of setting the jaws will be real a winner when setting up an odd shaped something with an offset hole to be bored.
cheers, shed
When you are putting a piece of stock in the 4 jaw chuck sometimes you might use a ruler and eyeball it across the jaws or maybe you just eyeball the rings on the face of the chuck in relation to the chuck jaws, sometimes you might get the bar stock close to centre but more often than not when you put your dial indicator on the bar stock it takes on the appearance of a clock on a time machine.
Using a ruler with a strategically placed 90 deg bend will place your bar stock (or pipe or whatever you are putting in the chuck) very close to centre in only a few seconds.
I seem to usually get within .010" to .030" from centre when nobody is watching and I am nearly blind as a bat.
I found the appropriate place to bend the ruler by dialing in a 40 mm dia piece of stock just tight enough that I could grab the stock and slide it out of the chuck by hand. You can use any diameter you like but just remember to set the ruler measurement to the radius of your stock.
Then placed the ruler on the jaw at the 9 o'clock position and aligned the 20 mm (for 40mm stock) line on the ruler with the chamfer at the outer edge of the chuck and then used a small square placed on the underside of the jaw with the blade of the square pointing up and against the face of the jaw and noted the measurement on the ruler to place the bend, soz, no pics of this but if anyone does not understand then I will do a pic.
You might have to tweak the bend a bit to get it right.
In use you set 2 jaws 90 deg apart to the radius of the bar stock, for example 50 mm dia bar stock you adjust the rule/jaw to 25 mm. For 60 mm dia set it to 30mm.
After you have adjusted the second jaw you rotate that jaw down and sit your stock against the 2 adjusted jaws and then nip up the remaining 2 jaws then indicate and do your final adjustments.
I have not done it yet but I think this method of setting the jaws will be real a winner when setting up an odd shaped something with an offset hole to be bored.
cheers, shed