Drilling blanks using lathe

[Woody]

I find it's always better to align the grain left to right, much easier than right to left or is it the other way round

Dose that include X cut blanks as well Stewart wellI was just asking OK by I wont slam the door on me way out he he he or will I

 

[Goulss]

Dose that include X cut blanks as well Stewart wellI was just asking OK by I wont slam the door on me way out he he he or will I

Diagonally of course, everyone knows that, up to down, or is it down to up, suppose it depends which way the lathe is spinning init

 

[Jimjam66]

So Baldy all you need to ask now is what is the correct way to dry wood, what is the correct way to sand it what is the best finish to apply and just for Brian what is the cheapest way to finish a bit of wood

But never, never, NEVER ask Grump which is the best quality kit to use ... You have been warned.

 

[Baldy]

Well it turns out that all of this thread would have been missed if I was not such an remit..:rolleyes:

It turns out I was doing it right... but I had not noticed that the tail stock screw was so loose that it was the tail stock that was spinning...

I however have learned valuable tips and insights from it all so

Thanks again and sorry for those that had to reach for their medication..

Sent from my KFTT using Tapatalk

 

[Lons]

Don't worry about the medication Baldy. It's compulsory whether or not controversial questions are posted, the NHS prescription bill just increases a little. It's a bit like the spike of electricity at half time in a cup final.
Y'never know, might have forced a few of use out of sleep and into incomprehensible jabbering whilst stabbing fingers at a keyboard in reply - Not me of course Now where did I put those tranquilizers?

 

[bellringer]

Don't worry about the medication Baldy. It's compulsory whether or not controversial questions are posted, the NHS prescription bill just increases a little. It's a bit like the spike of electricity at half time in a cup final.
Y'never know, might have forced a few of use out of sleep and into incomprehensible jabbering whilst stabbing fingers at a keyboard in reply - Not me of course Now where did I put those tranquilizers?

You do jabber a lot

 

[Walter]

Glad you got sorted Baldy. No need to apologise, we enjoy a good debate.

 

[Louie_Powell]

There are two ways to drill on the lathe. To make sure I understand the situation, I believe you said:

The blank is held in a scroll chuck mounted on the headstock spindle. The Jacobs chuck holding the drill bit is mounted in the tailstock morse taper. And the problem is that when the hole gets about 1/4" deep, the blank 'grabs' the wood - which means that the Jacobs chuck starts spinning in the tailstock. And then if you try to back the tailstock away, the bit remains captured in the blank and the Jacobs chuck slips out of the tailstock taper.

That's a very common problem. The solution is simply to grasp the Jacobs chuck with your left hand as you advance the tailstock ram with your right hand. The cause of the problem is that your Jacobs chuck isn't firmly seated into the Morse taper in your tailstock . Some Jacobs chucks are designed with a second taper - a JT33 - that fits into a matching taper inside the body of the Jacobs chuck - that just gives you a second taper that can slip, and twice the chances of the problem happening. In either event, the solution is the same - grasping the body of the Jacobs chuck will prevent it from spinning. And if you hold the Jacobs chuck you can also push it slightly toward the tailstock as you back the bit out of the wood to prevent breaking the seating of those tapers.

Louie

 

[ataylor]

Thanks for this Louie and can I be the 1st to welcome you to the forum.

 

[Lons]

You do jabber a lot

Good job I didn't see that before meeting you at York, you young whippersnapper:nonono: (Having said that, I do jabber a lot).
Didn't you understand the long words Alex?

Good to meet you yesterday, hope you managed to get all your goodies on the train OK. Should be ashamed bidding 20p on one of the auction items though

 

[Walter]

There are two ways to drill on the lathe. To make sure I understand the situation, I believe you said:

The blank is held in a scroll chuck mounted on the headstock spindle. The Jacobs chuck holding the drill bit is mounted in the tailstock morse taper. And the problem is that when the hole gets about 1/4" deep, the blank 'grabs' the wood - which means that the Jacobs chuck starts spinning in the tailstock. And then if you try to back the tailstock away, the bit remains captured in the blank and the Jacobs chuck slips out of the tailstock taper.

That's a very common problem. The solution is simply to grasp the Jacobs chuck with your left hand as you advance the tailstock ram with your right hand. The cause of the problem is that your Jacobs chuck isn't firmly seated into the Morse taper in your tailstock . Some Jacobs chucks are designed with a second taper - a JT33 - that fits into a matching taper inside the body of the Jacobs chuck - that just gives you a second taper that can slip, and twice the chances of the problem happening. In either event, the solution is the same - grasping the body of the Jacobs chuck will prevent it from spinning. And if you hold the Jacobs chuck you can also push it slightly toward the tailstock as you back the bit out of the wood to prevent breaking the seating of those tapers.

Louie

Welcome to the forum Louie.

I agree with your analysis of the problem (i.e. poor seating of the Morse Taper) but not with the method of resolving it. The proper thing to do in my opinion would be to ensure that the Morse taper is properly seated rather than holding on to the chuck whilst drilling. If the taper is properly seated holding the chuck is unnecessary as Doug's photograph of my demo at York yesterday shows. The chuck I was using has a No2 Morse taper in the tailstock quill and a JT33 taper in the body.

I do however also agree with your suggestion of holding the chuck as you back the bit out of the wood to prevent breaking the seating of the taper. That is good practice and a sensible safety measure.

All of this has already been explained in my tutorial here, where I also explain why I believe holding the chuck whilst drilling is unnecessary.