Brideport Drive pin?

[ty1295]

I have a Hartford Mill (bridgeport clone, down to font style on it)

Older, belt drive style. Machine works great, although I managed to shear the indexing pin inside the quill for the r8 collets.

Being I don't have a manual, anybody know the easiest way to replace it?

[wms]

TY,

You need to remover the "cap" on the end of the spindle.

There will probably have a set screw on the back side of the quill, that keeps the cap from turning,remove that first.

Next the cap will screw off. Be aware that a lot of them are left hand thread. Just depends on the machine.

Use a strap wrench to remove it.

After you remover the cap, you will see the collet indexing pin hole. It will have a locking set screw, a 1/2 set screw if you will.
Remove that and then you can remove the indexing one.

They can be a bear sometimes as they get smashed over and don't want to unscrew. You may have to use a small file to reach up into the spindle and clean it up before it will come out.

Good luck. Hope that helps.

[ty1295]

Thanks, that was exactly what i needed. Was able to fix it today.

Now got my next question to ask, but will post in new thread.

[machintek]

Just a few hints:
Usually I have to knock the spindle down an inch inside the quill to reach the collet aligning set screw easily.
I carry a end mill holder that I can use to keep the collet aligning set screw square to the spindle so I can tighten it without it turning.
When you tighten the spindle nose, make sure it pushes on the bearing races and does not bottom out on the end of the quill. This will keep your spindle from moving up and down and you get a better finish.
This means you ahve to "spot" a new recess in the qull nose so the set screw is recess below the surface of the quill.
DO NOT USE FORCE only finger pressure to tighten the nose set screw. Too much force "eggs" out the quill and it does not go up easily inside the quill housing.

george w.