ATS Systems Ultimate Chuck Installation and Operations Manual
Possible causes:
- RPM too high for the jaw selected, loss of grip force due to centrifugal force, part is released.
- Part inadequately gripped due to lack of proper chuck lubrication and resulting low grip force.
- Part inadequately gripped and pulled from jaw by an aggressive cutting tool.
- Part inadequately gripped due to poor choice of top jaw and pulled from jaw by even light cutting tool
force. (Such as soft jaws gripping an irregular rough casting.)
- Jaw positioned incorrectly or major workpiece gripping diameter variation (castings) causes jaw stroke
to reach bottom before properly gripping the workpiece. (Some lathes with some styles of stroke
control will protect from this.)
- Part inadequately gripped because the hydraulic pressure and resulting grip force is too low for the
application.
- The chuck actually breaks at some critical component either because the drawbar pull is way over the
maximum rating, or the chuck is used and fatigued for an extended time at a drawbar pull that is
perhaps only 20% over the maximum rating.
Now that I have your attention, we will go step by step through the safe operating practices of the
Ultimate Chuck. Note that all of what I've just said about the hazards and what I will now say about how
to deal with them applies to all power chucks, not just the Ultimate Chuck.
I have attached this maintenance and safety decal to your lathe. It summarizes the points I will now
cover and I encourage you to review it regularly.
This is the Installation, Operation and Maintenance Manual. It contains all the information I am
going to present and more. Please read it carefully and pay special attention to safety items in sections
1.1 through 1.3.8, safe jaw positioning in section 4.2 – 4.3, calculating safe operating speed for different
top jaws in section 4.5, and proper lubrication in section 5.2.
My training will now cover the following topics:
1. Safe chuck speed.
2. Changing, positioning and mounting jaws for safe operation.
3. Proper chuck lubrication.
4. Hydraulic pressure and proper drawbar / drawtube pull.
5. Chuck inspection and some miscellaneous safety instructions.
Safe chuck speed (RPM) is greatly influenced by the top jaws used. The maximum rated speed of
this chuck is ____ and applies only for normal chucking applications using the maximum rated
drawbar pull and only for standard top jaws such as our Deep Bite Job Shop Jaw. For any other top
jaws or conditions, speed must be reduced.
Always use the smallest, lightest, shortest jaw possible, and position it as close to centerline as
possible. Centrifugal force pulls on all jaws and reduces actual grip force. The further out from
centerline and the heavier the jaw, the higher the centrifugal force. When you do use oversize jaws or
even standard jaws if they are positioned very far out from centerline, you need to determine a safe
operating speed. You can either do this by using a dynamic grip force gauge and slowly raise the
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