开云体育

?

Hi,

The Morse taper is not designed to hold against radial loads - a force from the side will loosen it.

All the best,
Ian

On 20 Jul 2017, at 16:45, Alan Muller alan@... [7x12minilathe] < 7x12minilathe@...> wrote:

?

I've experienced many instances of Morse taper arbors shaking out of drill press spindles.? It seldom happens with ordinary twist drills,but it does with wood-drilling spade bits, sanding drums and wheels, etc.? From my point of view a drill press with provision for a drawbar would be a more useful tool..? (But, of course, ordinary drilling arbors are seldom threaded for a drawbar.....)

am

At 04:02 PM 7/19/2017 +0800, you wrote:

?

Sorry the last sentance should read
?"prefer held by a drawbar and not arbor"



Sent from my Samsung device


-------- Original message --------
From: "davebjames davebjames@... [7x12minilathe]" < 7x12minilathe@...>
Date: 19/07/2017 3:56 p.m. (GMT+08:00)
To: 7x12minilathe < 7x12minilathe@...>
Subject: Re: SV: [7x12minilathe] Taper size

?

Richard,

I started all of this. All I am saying is in my milling machine when I put in an MT3 arbor with a drill chuck for "DRILLING ONLY" I use a drawbar because I think it's a good idea.
In a drilling machine the MT arbor is in there so tight as it never gets removed so it should not fall out.? Whereas in a milling machine I remove an arbor maybe 3 or 4 times a day and I don't tighten them tightly (just firmly) to enable easy removal.
For safety reason I think I prefer it held by an arbor.

Dave
Borneo



Sent from my Samsung device


-------- Original message --------
From: "Richard edelec@... [7x12minilathe]" < 7x12minilathe@...>
Date: 19/07/2017 3:18 p.m. (GMT+08:00)
To: 7x12minilathe@...
Subject: Re: SV: [7x12minilathe] Taper size

?

Why oh why do people not read and understand what is written before making comments!
The original post was in response to the statement that a drill chuck should be held with an arbor in a milling machine when drilling.
I stated that it should not be necessary as the drill chuck should be held by the taper exactly as it is in a drill press (with knock out MT).
At no point did I discuss using a drill chuck to hold a milling cutter.
Hands up all the posters who use a drawbar to retain their chuck in their tail stock.
Richard

On 19/07/2017 01:30, old_toolmaker@... [7x12minilathe] wrote:

?

Richard,

A drawbar is definitely needed in a milling machine. Most end mills have flutes with a right hand helix which exerts force in a downward direction which can pull the end mill down and out if a collet. I have seen jobs ruined such as blind pocket work and mill tables scarred up by an end mill that drifted downward. This happen most often to the inexperienced and it has also happened to me until I learned the hard way. Always use a solid end mill holder of the Weldon type having a set screw on the end mill flat held in by a draw bar. That is what those flats are for besides preventing rotation of the end mill in the holder. These holders are available for all standard end mill shank sizes.
Of course there will be instances that prevent one from using these holders but they are the exception and not the rule.

Dick