Help Please!! Collet removal from Jet-16

[Thesenator]

Need help or suggestions to get a stuck collet out of an old JET-16 Drilling & Milling machine.

This was purchased used and has a tapered collet stuck in the shaft. I've tried hitting it with brass punch at a couple of different angles to no avail.

Any special proceedure to get this bugger out?

Thanks in advance.

Tom

[ 09-13-2006, 03:26 PM: Message edited by: Thesenator ]

 

[dsergison]

#1 change the post title to reflect the question

#2 HIT IT HARDER.

#3 What are you hitting? is this a morse taper or an r8 machine?

#3a - if morse taper... does it have a "window" in the quill for the drive wedge to knock the collet out?

#4 if r8 they could have sheared the key and spun the collet?

 

[Milacron]

Please edit your title so as to give some hint of what is contained within. "Help please!" is nearly meaningless and in fact sounds like spam to many of us used to seeing the phrase in BS email titles.

 

[awake]

Are you hitting the collet itself? If this is a Mill-Drill, then it should have a drawbar; progress from gentle tapping to firm whacking on the drawbar, but stop short of deforming the drawbar -- and make sure you have locked the quill before you start. If it is a Morse taper, then it can get very very tight indeed; I'd look for a slot to use a drift.

Pictures would help us to give you a more meaningful response. Also, it is not clear how much experience you may have -- the impression I get from your post is that you are a newbie; if you are not a newbie, we may be giving you suggestions you've already tried.

Oh, yeah -- and change the title of your post, and you'll get a lot more response! (Just in case you haven't heard that already

)

 

[Dave A]

Since this was your first post, you change the title of the thread by using the edit icon, which is the one to the far right of your post.

 

[swarfed]

If it's TheSenator from Massachusetts asking how to remove a stuck collet, first you set up a committee to do an environmental impact study on the effects of unsticking the collet. Then you appropriate $100 million for the "Little Dig" project, then pay a bunch of contractors to look at it and fall way behind schedule and over budget, then let it just fall out on it's own because it wasn't properly secured in the first place.

 

[matt_isserstedt]

One thing...using a deadblow mallet is pointless.

You need something harder that will deliver a sharp "rap".

Best I have found is a rawhide mallet, it will still deliver the required rap (R8) while still being soft-faced and not deform anything.

If the end of the collet protrudes from below the spindle's bore, you can gently try striking the edge of the collet at right angles to the spindle centerline, with the brass punch...oftentimes a little sideways "rocking" motion goes a long way to loosen a stuck collet.

 

[Thesenator]

Thanks guys, got it out. It had been sitting in there for over ten years and just need a little tap on the shaft on top after loosening.

Thanks for the replies and sorry for the incomplete title, will work on it in the future.

 

[swarfed]

A little tap on the drawbar (the threaded bar that secures the collet) is standard procedure for removing a collet on many mills. The taper uses friction to hold and drive the collet/tooling, it usually takes a little something to break it loose. Your Jet is likely an R8 taper, and has a slot on the collet and a corresponding pin in the spindle. The pin isn't the only thing driving collet, and in fact there are some people who advocate removing the pin conpletely, having friction alone hold things in place - this prevents shearing the pin off and damaging the spindle if the collet was too loose. Either way, make sure you tighten the drawbar enough to draw the collet tightly into the spindle to prevent possible collet/spindle damage.