RayJohns
Aluminum
- Joined
- Sep 13, 2009
- Location
- West Coast
Hi,
I have a question regarding a JT33 taper. I am restoring my Dad's old craftsman drill press (model # 113.21370), which he purchased in 1974 and which I used growing up. Everything is in great shape and the drill press works fine. I have replaced the bearings on the spindle shaft (which the chuck attaches to).
On the end of the spindle shaft, there is a JT33 taper, which the chuck attaches to. The original Craftsman chuck has a collar, which threads onto a threaded collar, which is pinned to the spindle shaft (just above the taper). When you thread the chuck onto this collar, it pulls it up tight and keeps the chuck from coming loose.
Okay, so here is my question:
I purchased two extra chucks - both of which have a JT33 taper. However, these new chucks don't have the little threaded locking collar affair - they just engage onto the JT33 taper as normal. If I push the chuck onto the taper and twist, it mounts very tightly. I have checked the specs of the JT33 taper and it appears to be fine. I have also polished up the surface and checked it using Dykem blue. If I blue it and then put the chuck on (and twist it up and secure it), then it pretty much evenly wipes away the blue - which indicates to me that it's making good surface to surface mating.
My problem is that when using the chucks without the locking collar, the chucks seem to have a nasty habit of dismounting. If the drill chatters on the work (or if I use an end mill or something which produces excessive vibration), then the chuck will loosen up and drop off.
Shouldn't the JT33 taper be enough to secure the chuck and hold it? Or am I expecting too much? My assumption was that the locking collar was there simply as an added margin of safety (for example, in case someone uses the drill press with a buffing wheel or something), but now I'm wondering if it's there because the JT33 taper alone isn't able to hold the chuck up on the drill press.
I don't have any experience with morse tapers or anything like that. This JT33 is my first experience with tapers. Should the taper, by itself, be enough to hold the chuck on the spindle while drilling metal? Or am I expecting too much?
Any information would be most appreciated. Thanks!
Ray
I have a question regarding a JT33 taper. I am restoring my Dad's old craftsman drill press (model # 113.21370), which he purchased in 1974 and which I used growing up. Everything is in great shape and the drill press works fine. I have replaced the bearings on the spindle shaft (which the chuck attaches to).
On the end of the spindle shaft, there is a JT33 taper, which the chuck attaches to. The original Craftsman chuck has a collar, which threads onto a threaded collar, which is pinned to the spindle shaft (just above the taper). When you thread the chuck onto this collar, it pulls it up tight and keeps the chuck from coming loose.
Okay, so here is my question:
I purchased two extra chucks - both of which have a JT33 taper. However, these new chucks don't have the little threaded locking collar affair - they just engage onto the JT33 taper as normal. If I push the chuck onto the taper and twist, it mounts very tightly. I have checked the specs of the JT33 taper and it appears to be fine. I have also polished up the surface and checked it using Dykem blue. If I blue it and then put the chuck on (and twist it up and secure it), then it pretty much evenly wipes away the blue - which indicates to me that it's making good surface to surface mating.
My problem is that when using the chucks without the locking collar, the chucks seem to have a nasty habit of dismounting. If the drill chatters on the work (or if I use an end mill or something which produces excessive vibration), then the chuck will loosen up and drop off.
Shouldn't the JT33 taper be enough to secure the chuck and hold it? Or am I expecting too much? My assumption was that the locking collar was there simply as an added margin of safety (for example, in case someone uses the drill press with a buffing wheel or something), but now I'm wondering if it's there because the JT33 taper alone isn't able to hold the chuck up on the drill press.
I don't have any experience with morse tapers or anything like that. This JT33 is my first experience with tapers. Should the taper, by itself, be enough to hold the chuck on the spindle while drilling metal? Or am I expecting too much?
Any information would be most appreciated. Thanks!
Ray