Startrite Drill Press(benchtop) – stuck chuck

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Startrite Drill Press(benchtop) – stuck chuck

This topic has 10 replies, 6 voices, and was last updated 26 September 2019 at 22:06 by Howard Lewis.

Viewing 11 posts - 1 through 11 (of 11 total)

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23 September 2019 at 20:09 #430178
Jim Dalton 1
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@jimdalton1
Hi all

Picked up a Startrite Mercury 5 speed benchtop drill press the other week. I knew buying it that the run-out on the chuck wasnt perfect but took the chance as it possible was a good price.

Unfortunately I can't remove the chuck. As far as I can see, there are two knurled nuts, but the top one isn't accessible. Probably best described by photo below. Any thoughts on how to fix?
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23 September 2019 at 20:09 #26855
Jim Dalton 1
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@jimdalton1
23 September 2019 at 20:32 #430181
Mike Poole
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@mikepoole82104
The shiny part shielding the top nut appears to have been added, if you remove the screws holding it it may give you the access you need.

Mike
23 September 2019 at 20:48 #430186
Clive Foster
Participant
@clivefoster55965
Plenty of pictures of the small startrite drills which may help here :- **LINK**

Agree with Mke that the shiny ring needs to be removed for better access. Chuck doesn't look right. Should be a male JT 33 taper on the spindle for the chuck to fit on. The threaded rings are really to hold a JT33 to MT1 adapter sleeve. Pictures in the link above. Theoretically unscrewing the lower ring would force the standard chcuk off but I have my doubts.

I'd be doing something clever with a pair of chuck wedges and some sort of clamp to draw them together so forcing the chuck off.

Last time I saw a set up looking like that, complete with runout too, a sort of metric B series taper chuck had been pushed onto a JT spindle. On examination chuck body taper was sort of in between JT and B series! Presumably so it could eb forced onto either and stay put.

Speeds are rather high for metalworking. Seriously consider slower motor, three phase and VFD or inverting the motor and fitting an extra shaft with suitable speed reduction pulleys. Rob a defunct spin drier for a suitable shaft and bearing unit, maybe a pulley too.

Clive
23 September 2019 at 21:36 #430201
Jim Dalton 1
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@jimdalton1
thanks guys.
24 September 2019 at 18:46 #430295
Dave Halford
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@davehalford22513
Startrite also make woodworking machinery
24 September 2019 at 19:33 #430313
Hacksaw
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@hacksaw
And kids shoes…
24 September 2019 at 21:29 #430335
Jim Dalton 1
Participant
@jimdalton1
Managed to get the chuck off. Measured the run-out at the end of JT spindle and am getting .050mm run-out. Although chuck looks in good order, it's a Rohm.
25 September 2019 at 11:53 #430395
Howard Lewis
Participant
@howardlewis46836
0.05 mm (0.002" ) run out does not sound too bad for a drill press, rather than a jig borer..

The chances are that your drills will not have absolutely equal length cutting edges, either, so will cut oversize!

If the chuck arbor is mounted in an adaptor, maybe that is the source of the run out? It should not be, BUT!

If you can remove the adaptor, is the MT section undamaged?

Is the MT in the quill undamaged? They are both possible sources of inaccuracy.

Any play in the bearings for the quill, that might be allowing the run out?

HTH

Howard
25 September 2019 at 21:37 #430466
Jim Dalton 1
Participant
@jimdalton1
Thanks Howard. Will check those items. I assume that the chucks themselves tend not to be most source of runouts?
26 September 2019 at 22:06 #430629
Howard Lewis
Participant
@howardlewis46836
As far as I know, Rohm chucks have a good reputation.

But bear in mind that they are drill chucks, so probably not as accurate as a collet chuck of equal quality intended to hold cutters or work.

Howard
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