Drill press run-out (reducing it?)

[julianf]

I bought a used (spares or repairs) drill press from here a while back, and have eventually got around to buying a chuck for it (jacobs 14n).

The press all works nicely, but the run out is no better than my ancient warco thing.


Its usable, but if your holding the job by hand, there's noticeable wobble on the work as the drill engages.

The chuck and arbour are new, so i assume they are good.

Is there much you can do to reduce run out?

The press is one of these -

but re-badged by axminster tools. Theyre (as most axminster stuff is) re-badged Chinese stuff. The original price was (as most axminster stuff is) eyewatering, so its mid range, rather than junk.

Ive attached the parts diagram pdf to this mail, and the diagram (if anyone is that keen!) is on page 9.

Again, its not prime old British made cast, but its also not pocket change, so, if it can be made good, that would be nice. Again its not terrible now, and i in no means regret the purchase, but it would be nice to make it better if i could!

Thank you.

 

[roofman]

Have you checked for any grub screws to take the slack out the quill?...crude design but it can help on these Chinese castings. other than that its got to be poor quality/tolerance top and bottom bearings.

 

[Seadog]

Don't assume that the chuck is running true just because it's new.

 

[brightspark]

Don't assume that the chuck is running true just because it's new.

if its on a taper take it off and clock the spindle taper with a dial gauge for any run out

 

[premmington]

I got big JET drill press - floor standing thing from Axminster - same thing - run out is appauling. Was like it out fo the box.

I only use it for drilling holes in plate.

Given up with drill presses - now use my mill for drilling most things - table is bigger and can adjust the X/Y.

 

[Screwdriver]

Yes, first you need to establish where the runout is.

Assuming it isn't everywhere!

 

[Brad93]

Most drill chucks especially modern jacobs aren't particularly straight.

You need to check the taper fit against a known good (ideally new) mt sleeve or drill.

 

[premmington]

Most drill chucks especially modern jacobs aren't particularly straight.

You need to check the taper fit against a known good (ideally new) mt sleeve or drill.

AGREE - Yeah cheap chucks are just that - cheap.

Good drill chuck is "proper money".

------------

Dad put a MT taper drill in mine and it is not much better - so the replacement chuck is not to fault (or not adding too much to it).

 

[julianf]

The chuck is one of their "super" ones, bought on the general comments here that the normal ones are poor, but the "super" are still ok.

But, youre all right - i shouldnt assume its good.

Ill get the dial gauge out tomorrow and investigate further.

Thank you.

 

[Brad93]

AGREE - Yeah cheap chucks are just that - cheap.

Good drill chuck is "proper money".

------------

Dad put a MT taper drill in mine and it is not much better - so the replacement chuck is not to fault (or not adding too much to it).

Either a bent spindle, really bad bearings or a ding in the taper

 

[Agroshield]

...if you're holding the job by hand, there's noticeable wobble on the work as the drill engages.

Just taking the above phrase at face value, even the best drill press in the world will display exactly the same behaviour.

As the flutes of the drill bit engage on the work, they try to move it. If you are holding it in your hand, they will succeed. You can see it more clearly on thin material as the tip will break through before the full diameter engages, and then the hole is noticeably trilobular.

I can hold a stub drill bit in an ER collet done up FT in a 40 taper milling machine and if I hold the workpiece by hand, I will experience the same thing. Drilling on a lathe using the tailstock, you see the drill bit itself wobble as it engages the hole because it is less stiff than the work.

 

[julianf]

There's visible wobble in the chuck also.

But, yes, it could be coming from anywhere. Ill get the gauge on it.

 

[indy4x]

trilobular.

Love it

 

[premmington]

Just taking the above phrase at face value, even the best drill press in the world will display exactly the same behaviour.

As the flutes of the drill bit engage on the work, they try to move it. If you are holding it in your hand, they will succeed. You can see it more clearly on thin material as the tip will break through before the full diameter engages, and then the hole is noticeably trilobular.

I can hold a stub drill bit in an ER collet done up FT in a 40 taper milling machine and if I hold the workpiece by hand, I will experience the same thing. Drilling on a lathe using the tailstock, you see the drill bit itself wobble as it engages the hole because it is less stiff than the work.

In bold - I had to google the meaning! @indy4x