# Changing chuck jaws **URL:** \ **Category:** Elite Masso Rotary\ **Created:** [April 29, 2025, 9:33pm UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802 "2025-04-29T21:33:44Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![RTJ](https://avatars.discourse-cdn.com/v4/letter/r/ad7895/32.png) [@RTJ](https://forum.onefinitycnc.com/u/RTJ)\ **Post date:** [April 29, 2025, 9:33pm UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/1 "2025-04-29T21:33:44Z")
Is there a video showing how to change the chuck jaws? The manual (p 37) says to start with #1, then install them in numerical order (2, 3, 4). However, in the next paragraph, the manual says to “place the second jaw in the next slot, moving in a clockwise pattern, repeating this process until all four jaws are seated.” The next slot clockwise from #1 is number 4. To seat them in numerical order we have to go counterclockwise. We’ve tried it both ways without success. ---
**Author:** ![Ken5](https://avatars.discourse-cdn.com/v4/letter/k/f0a364/32.png) [@Ken5](https://forum.onefinitycnc.com/u/Ken5)\ **Post date:** [April 29, 2025, 10:14pm UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/2 "2025-04-29T22:14:15Z")
So each jaw has a number that must be put in the correct spot (numbers must match on the jaw and chuck) I struggled for 10 minutes till I figured it out Once I got them in the correct order I made sure they were at 12, 3, 6,9 o’clock. Then with slight pressure ,on each jaw, they mesh as you turn the chuck key ![IMG_2161](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/7/a/7a7a4a3f56081e8e246a241d2ca776c83aa37832.jpeg) ---
**Author:** ![poppyscott](https://avatars.discourse-cdn.com/v4/letter/p/a587f6/32.png) [@poppyscott](https://forum.onefinitycnc.com/u/poppyscott)\ **Post date:** [April 29, 2025, 11:29pm UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/3 "2025-04-29T23:29:27Z")
Depends on which side of the chuck you are on. One way is right to number 2, from the other side it is left to number 2. ---
**Author:** ![jdfarr1973](https://avatars.discourse-cdn.com/v4/letter/j/50afbb/32.png) [@jdfarr1973](https://forum.onefinitycnc.com/u/jdfarr1973)\ **Post date:** [April 30, 2025, 6:07pm UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/4 "2025-04-30T18:07:33Z")
Looking at the face of the chuck, the numbering is almost always CCW. Industry standard I think. ---
**Author:** ![terrycoplin](https://avatars.discourse-cdn.com/v4/letter/t/977dab/32.png) [@terrycoplin](https://forum.onefinitycnc.com/u/terrycoplin)\ **Post date:** [April 30, 2025, 9:43pm UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/5 "2025-04-30T21:43:49Z")
Same here only it took me 20 minutes to figure it out. ---
**Author:** ![RTJ](https://avatars.discourse-cdn.com/v4/letter/r/ad7895/32.png) [@RTJ](https://forum.onefinitycnc.com/u/RTJ)\ **Post date:** [May 1, 2025, 12:28am UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/6 "2025-05-01T00:28:39Z")
OK, I got the jaws changed. I did them in order 1, 2, 3, 4 and rotated the chuck key clockwise to get them to seat in order. ---
**Author:** ![greecher](https://avatars.discourse-cdn.com/v4/letter/g/22d042/32.png) [@greecher](https://forum.onefinitycnc.com/u/greecher)\ **Post date:** [August 3, 2025, 5:38am UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/7 "2025-08-03T05:38:22Z")
Standard lathe (metal) setup. Just unwind the screw until one comes out, you may want to note the number of the jaw. Keepe unscrewing till the second thru fourth come out. The number order is the same order to put in the alternate jaw set, with the last number the same slot being to put the first jaw piece. You only need about an eighth turn and you’ll need to have the next inserted after the first starts, as the spiral has a lead point that engages the teeth. After you have all of them engaged, make sure to spin them all the way in, as they should all neatly and squarely align. If they don’t, all it means is that you either started one too late, or the jaw numbers didn’t go in the correct position. The reason they are numbered is that they are finished machined in those slots to ensure proper balance and mating. ---
**Author:** ![HardtailSr](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/hardtailsr/32/35326_2.png) [@HardtailSr](https://forum.onefinitycnc.com/u/HardtailSr)\ **Post date:** [August 3, 2025, 3:31pm UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/8 "2025-08-03T15:31:12Z")
excellent summarization of this topic. I commend you. ---
**Author:** ![joejk](https://avatars.discourse-cdn.com/v4/letter/j/aeb1de/32.png) [@joejk](https://forum.onefinitycnc.com/u/joejk)\ **Post date:** [August 4, 2025, 2:56am UTC](https://forum.onefinitycnc.com/t/changing-chuck-jaws/32802/9 "2025-08-04T02:56:28Z")
Hi all, I am a machinist for over 40 yrs. So something I learned way back as a student in trade school is when you want to know which way is clockwise or counter clockwise of a spindle is to look through the spindle. In this case from the motor side of the chuck to know which way is which. So in the above picture looking at the face of the chuck is the wrong way to look at it. If you look through the chuck from the back side clockwise and counter clockwise will be right.