Drilling problems with a 9a

Ok, so I ran it on the highest speed today, and I now see that my center drill is mildly shaking vertically, which I suspect is the problem.

So perhaps it is alignment after all...
 

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Tail stock out of alignment.

Make a spool to check it.

Search my posts for a detailed instruction on making and using.

Sent from my SM-G781V using Tapatalk
 
Your threads on making a spool require drilling a center. :)
tq60 said:
Tail stock out of alignment.

Make a spool to check it.

Search my posts for a detailed instruction on making and using.

Sent from my SM-G781V using Tapatalk
Click to expand...
Your threads on making a spool require drilling a center. So...
 
It's possible that the base of your tailstock is worn from years of use. If so placing the correct size shim stock between the upper and lower half of the tailstock will take care of it.
 
brandon428 said:
Ok, so I ran it on the highest speed today, and I now see that my center drill is mildly shaking vertically, which I suspect is the problem.

So perhaps it is alignment after all...
Click to expand...
A drill will try to self center - even with it being out of alignment. This doesn't explain why it isn't drilling into mild steel (it does explain why you are breaking small bits).
 
brandon428 said:
Your threads on making a spool require drilling a center. :)

Your threads on making a spool require drilling a center. So...
Click to expand...
In the old bays you marked the center with a square and drilled it on your bench.

If a center drill does not work it is baaaaad.

One could try extending the quill fully with leaving the tail stock loose and pushing by hand.

It will self center maybe.

Or...

Just face the stock and notice the bump in the middle.

Place a center in the tail stock and adjust until it aligns.

Not perfect but close enough to possible work.

Sent from my SM-G781V using Tapatalk
 
They sell offset bolts . Perhaps you could find an offset chuck ? ! :D

me.me

BOLTS COD COD for Holes Counfot for Roles Drillad Too Deep Crooked Then for Misnatched for Holes Too Near the Edge Holes Straight for Holes Counter for Holes Drilled Binocular Bolt for for Holes Not Double Drilled Holes Dried Straight Sunk on Wrong S

BOLTS. COD COD For Holes Counfot For Roles Drillad Too Deep crooked Then For Misnatched For Holes Too Near The Edge Holes straight For Holes Counter For Holes Drilled Binocular Bolt for For Holes Not Double Drilled Holes Dried straight sunk on wrong side. Too Big Then Right...
me.me me.me
 
SLK001 said:
A drill will try to self center - even with it being out of alignment. This doesn't explain why it isn't drilling into mild steel (it does explain why you are breaking small bits).
Click to expand...

brandon428 said:
When I use the chuck, it moves slightly up and away
Click to expand...

The chuck is "probably" pulling towards the rotation center which might help with the shimming of the tail stock.

Stu
 
I ordered an Edge Tailstock Alignment Bar and found I was off .003 vertically and .015 horizontally. I shimmed the tailstock by .004 (assuming the bed is more worn closer to the headstock) and corrected the horizontal. Drills now stay centered (don't move/shake) and drill clean. Not like butter, but they go.

Surprised that being offset by such a small amount makes so much of a difference, but I guess I shouldn't be.
 
I doubt very much that being a few thousandths off would cause a center drill to break. Without seeing how hard you are feeding that center drill and not knowing your experience level I'm just guessing, but all the guys who broke center drills where I used to work were feeding them too hard for the speed of that the spindle was running, both in lathes and mills. They are fairly delicate and break easily. You need to baby them and use plenty of oil.

Ted
 
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