Holding tapered bar in a lathe chuck.

[Pete RimmerParticipant @peterimmer30576]

Yep it’s rock solid. I tap them home with a plastic faced hammer and it takes a much larger whack to get them out. When it’s in the chuck there won’t be any moving it.

[DiogenesParticipant @diogenes]

Thanks 👍

[cedric 1Participant @cedric]

<p style=”text-align: left;”>Don’t underestimate the holding power of a taper. Many a motorcycle main engine sprocket and automotive camshaft sprockets etc are held on by a taper, requiring large force with a stout puller plus impact to break them loose. And think of tie-rod ends on a motorcar. Massive force used to break them apart. And they all use a much more obtuse taper than the OP, or Morse, taper pin etc.</p>

[JasonBModerator @jasonb]

But they do have a nut to stop them coming loose!

[DiogenesParticipant @diogenes]

I know they hold, it’s just not always predictable what activities will loosen them – and for this machining op, they’re not going to be fitted with the same degree of ‘semi-permanent’ seating as they would with a flywheel or track rod.

[JasonB]

On JasonB Said:

But they do have a nut to stop them coming loose!

Not when you come to remove them with a puller as I said. Some of those tapers can be so tight they need heat to break them loose, even with a stout puller exerting massive force on them.

[cedric 1Participant @cedric]

You will need to drill a centre hole in the end before turning the taper with tailstock centre support anyhow. So then drill and tap the full hole after turning the taper but before parting the pin off and then flipping it around to dome the large end.

So no need for holding the taper during drilling and tapping if that worries you.

[Pete RimmerParticipant @peterimmer30576]

For my purposes with the morse taper arbor fitted firmly in the sleeve putting it in the chuck transfers all the chuck grip through the sleeve into the arbor as if it were all one single part.

[Pete Rimmer]

On Pete Rimmer Said:

For my purposes with the morse taper arbor fitted firmly in the sleeve putting it in the chuck transfers all the chuck grip through the sleeve into the arbor as if it were all one single part.

<p style=”text-align: left;”>Yes, amazing grip on tapers which is easy to underestimate. Even a bushing with a parallel bore can be tapped onto an arbor with a few thou taper and quite heavy cuts taken off the OD of the bushing.</p>

[Author]

Posts