morse taper on drill press chucks

[toplessHO]

I just picked up an off shore floor stand drill press.
Actually not a bad deal for $75.
Its got a brand new 3/4 chuck on it,.marked JT-3
the nameplate on drill,says spindle is an MT-3
My other drill press (Delta/Rockwell made in USA) has a chuck I replaced with a 5/8 grizzly and is marked JT-33.
Please explain why these seem to fit but are marked completely different.

 

[marinusdees]

Google it. It will call out the dimensions, and they are not the same.

 

[shawhite]

MT3 Morse taper 3. This refers to the arbor that attaches to the chuck. The spindle of the drill press accepts a MT3 arbor rather than just having a JT33 or similar at the spindle to accept a chuck. The MT3 makes the drill press more versatile. The chuck fits on the arbor with a different type of taper. JT3 is a jacobs taper. There are a lot of different arbor tapers and chuck tapers so you would have to google to find any additional specs.

 

[neophyte]

The wikipedia entry for machine tapers lists dimensions for the various types, but the dimension charts aren’t consistently formatted for the different types, do it’s hard to cross reference the dimensions.
If the drill was made in Asia, it’s fully possible the manufacturer listed the wrong taper on the drill, or chuck, because the fine points of the different standards sometimes get lost Overseas.
Makita for instance, used Whitworth Nuts on their old grinders, but the wrenches supplied with the grinders were metric.

The other possibility, is that the chuck has an internal recessed taper, rather than a fixed taper shaft, and the chucks internal taper is JT-3,
and the drill also has an internal taper, which is the MT-3,
And the manufacturer mounted the drill chuck on a JT-3 to MT-3 double tapered arbor yo mount the chuck on the drill.

 

[toplessHO]

The wikipedia entry for machine tapers lists dimensions for the various types, but the dimension charts aren’t consistently formatted for the different types, do it’s hard to cross reference the dimensions.
If the drill was made in Asia, it’s fully possible the manufacturer listed the wrong taper on the drill, or chuck, because the fine points of the different standards sometimes get lost Overseas.
Makita for instance, used Whitworth Nuts on their old grinders, but the wrenches supplied with the grinders were metric.

The other possibility, is that the chuck has an internal recessed taper, rather than a fixed taper shaft, and the chucks internal taper is JT-3,
and the drill also has an internal taper, which is the MT-3,
And the manufacturer mounted the drill chuck on a JT-3 to MT-3 double tapered arbor yo mount the chuck on the drill.

I need to elaborate a little
The newly acquired drill press was marked spindle MT-3 ,5/8 on the data plate,
so Im assuming it came with a 5/8" capacity chuck.
The chuck has been newly upgraded to a 3/4" thats marked JT-3.

 

[txvwnut]

The JT taper is Jacobs taper and that refers to the taper that engages the the chuck not the quill on the drill press which in your case seems to be MT3. So if your swapping chucks assembled onto MT3 arbors between two drills you won’t notice the difference in the JT3 to JT33. Im not sure how much difference there is between JT3 and JT33 to know if you fit a 3 to 33 and vis-a-versa. The original chuck may have had an integral shank which had the MT-3 taper which would explain why it’s listed as MT-3 5/8.

 

[macgee]

This is what you have inside your drill press, It a mating spindle that is already inside your drill press?

If you have one inside, you just cant' tell, its inside the shaft (the MT3 end is up), (MT stands for "machine taper") you use a drift key wedge tool placed into the rectangular holes in the shaft column when spindle is down access holes to remove the MT3 spindle that has a JT33 taper on it (bottom) that is holding your drill chuck. You can use any drill chuck with any JT taper as long as the spindle has a MT3 on the other end to go into your drill press.

They're nifty as you can quickly swap out different drill chucks or the accessories instead of a drill chuck.

Good luck

https://www.amazon.com/Morse-Taper-Drill-Chuck-Quality/dp/B01BPJCT1C

`

 

[BukitCase]

My ancient taiwanese DP has a female MT2, for a while I had a 3/4" Jacobs Super chuck on it. That takes a male JT4, took awhile to find the right adapter. When I got my grizzly G0755 mill I found an R8 to JT4 adapter and put a smaller chuck back on the old DP. The 3/4" chuck is a MUCH better match for the mill - Here's a link to a decent taper chart

https://littlemachineshop.com/reference/tapers.php

HTH... Steve

 

[Milton Shaw]

Nobody else has mentioned this but you can buy drills with MT tapers on them and eliminate the chuck completely. These are usually used in machine shops and also lathe tailstocks. They make MT1, Mt2, MT3, Mt4 etc. and also adapters that change 1 to 2 etc. The drills are usually stronger and more accurate than drill chuck and will also slip less as most have a flat tang that locks in the drill press spindle. Usually can find in flea markets etc. at really good prices. Sounds like you got a good deal.

 

[toplessHO]

I bought it because the table on my Delta/Rockwell is broken
and this mast is the same size(2-3/4").
Now Im thinking its too good,even at the $75 price to cannibalize.

 

[macgee]

I bought it because the table on my Delta/Rockwell is broken
and this mast is the same size(2-3/4").
Now Im thinking its too good,even at the $75 price to cannibalize.

Take a pic of your drill press and post it.

 

[toplessHO]

Take a pic of your drill press and post it.

which one?
heres a couple of the newly acquired one


name tag says 1 HP
16 speed
Ram Machinery model 019B
made in Taiwan

 

[macgee]

which one?
heres a couple of the newly acquired one


name tag says 1 HP
16 speed
Ram Machinery model 019B
made in Taiwan

You maybe out of luck swapping tables, the taiwan column is metric and Delta is imperial (If made in the US), newer ones are also metric so you maybe ok. Even though it measures similar, even 1/32" can make a massive difference on whether they're compatible or not. I've tried

Taiwan DP's are pretty good, having 16 speeds is nice. $75 is Definitely a good price if working correctly.

 

[toplessHO]

You maybe out of luck swapping tables, the taiwan column is metric and Delta is imperial (If made in the US), newer ones are also metric so you maybe ok. Even though it measures similar, even 1/32" can make a massive difference on whether they're compatible or not. I've tried

Taiwan DP's are pretty good, having 16 speeds is nice. $75 is Definitely a good price if working correctly.

built in light doesnt work(seller advised me of this)
No problem,I ll fix when I get the time.

I havent measured the mast yet,I asked the seller to,before I went to buy it.
If it doesnt fit,I still have a working drill press,and for the price I ll live with it.

 

[The Cobbler]

the light is very likely just the switch or the socket . my taiwanese DP was missing the center tang for the light bulb. it had got brittle & broke off. I replaced it with a GU10 socket & LED

 

[macgee]

built in light doesnt work(seller advised me of this)
No problem,I ll fix when I get the time.

If the only issue with that DP is the light, then give yourself a high five; you won.

 

[laser3kw]

Nobody else has mentioned this but you can buy drills with MT tapers on them and eliminate the chuck completely. These are usually used in machine shops and also lathe tailstocks. They make MT1, Mt2, MT3, Mt4 etc. and also adapters that change 1 to 2 etc. The drills are usually stronger and more accurate than drill chuck and will also slip less as most have a flat tang that locks in the drill press spindle. Usually can find in flea markets etc. at really good prices. Sounds like you got a good deal.

I use to have my big drills with Morse taper and then a Jacob chuck for all the smaller drills (<1/2")