View Full Version : Jet Mill/drill speeds

10-21-2008, 10:40 AM
Hi, first post and already asking for help. I have a Jet model 16, with 12 speeds listed on the front panel. Problem is there are four belts and pulleys and no setup chart. I suspect it would be listed in the manual, but can't find a manual. Can anyone help? I could with enough time figure it out, but looking for the easy way.

Thanks Tom

10-21-2008, 11:42 AM
go to jet tools.com and look for a manual. wmh tool group (do a gooogle on this) owns jet and manuals are very available if you have a model number.

10-21-2008, 12:16 PM
Sorry, should have mentioned, that I have tried all the internet sources. I have a model 16 made in 1981 and they don't seem to go back that far.


10-21-2008, 01:53 PM
Did you try contacting their customer help line at the top of this page?


Peter N
10-21-2008, 03:56 PM
Simple, all you need to do is measure the diameters of the pulleys – approximate is fine, you don’t need to be dead accurate – and you need to know the speed of your motor.

Then use the formula: (driver ๗ driven) x input speed = output speed.

For example, if the top sheave diameter on the motor pulley is 3”, and the top sheave diameter on the spindle pulley is 8”, and your motor speed is 1500 rpm, then:

(3 ๗ 8) x 1500 = 562.5 rpm

Easy when you know how to do it.


10-21-2008, 05:05 PM
Thanks, I will give that a try.


10-21-2008, 06:33 PM
On the off chance that it's the same as other Rong Fu clones, here is the belt chart from my early-80's Enco mill drill, which is more or less a clone of a RF-30.

Note that the chart lists different speeds for 4 and 8 pole motors, as well as for different frequencies. http://img235.imageshack.us/img235/3995/encobeltchartei7.jpg (http://imageshack.us)

10-21-2008, 11:19 PM
Here's the Jet 16 chart from my manual. It's a great little machine, I've had mine since 92.


10-22-2008, 10:44 AM
I can't thank you enough, exactly what I needed. Just installed my mill and have not started using it yet. Looks like a capable machine for the limited space I had.

Thanks again Tom

10-22-2008, 11:08 AM
Good luck with your new toy. Here's a thread about my adding a power feed. It's sweet. http://bbs.homeshopmachinist.net/showthread.php?t=22721&highlight=power+feed+asong

I also recommend getting an ER32 collet chuck, and mounting a dro, or a cheap digital caliper, on the quill. You can get the chuck & collets on ebay for under $100. The only other pimping out I've done is a VFD variable speed drive.

Bill Pace
10-22-2008, 11:31 AM
Hey Tom,

Enjoy that new toy ... theyre tough little machines and can turn out some good work (yeah, yeah, youll have to get used to the round column's idiosyncrasies, but it aint that big a deal!)

Was wondering if you heard of the mill-drill group over at yahoo --


There are some really neat mods that have been dreamed up for these ... take a stroll thru the photo & file section.

10-22-2008, 04:54 PM
Thanks, I will take a look. I really wasn't expecting this much help, I tried this on another forum and got the "shut up and go color" routine. I know little to nothing about a mill, so Er32 collet chuck means little. I have a set of #3 Morse taper collets and a few end mills to break. I am sure I will be back with a ton of dumb questions.

Thanks Tom

10-22-2008, 06:41 PM

a collet chuck goes into the mt3 and stays there, then you change the ER collets in the chuck without having to mess with banging on a drawbar, mt3's can be tough to get out! (R8's are easier) The other huge advantage they have besides convenience is that the set of collets is continuous, each fitting a 2mm range. This means you can hold any drill or tap without having to fit a jacobs chuck in the taper and raising your head up to accomodate the extra length.

all in good time though, make some chips for now!

Here's site that might interest you, it's machining training videos from MIT's AI lab http://techtv.mit.edu/file/743/

10-23-2008, 06:14 PM
Thanks again, I spent a good portion of today watching videos. Neat stuff and will keep me from having to ask a bunch of dumb questions.