Q-Mark Product Spotlight for May 2018
Cylinder styli are used to measure edge features, like sheet metal edges, stampings, or thin lands between grooves. We manufacture cylindrical styli from stainless steel, carbide, and ruby. They are available in all thread sizes. We have a wide selection of standard diameters and lengths, or they can be manufactured to your specifications.
Please note that cylinder styli are not suitable for high-accuracy work, because their form is less precise than our spherical styli. In addition, cylindrical styli require a special calibration routine. Just click on the FAQ tab on our website (www.cmms.com) for help with calibrating a cylinder stylus.
Q-Mark Product Spotlight for April 2018
Electrically Conductive Styli
Many probe systems use a mechanical switch to sense when they “touch” a surface. A few, however, rely on an electrical signal to confirm contact. These probe heads use electrically conductive styli. Q-Mark makes a full selection of styli that are electrically conductive. We use carbide spheres, one-piece stainless steel base and stem, and an electrically conductive bonding agent to bond the sphere to the stem. Our electrically conductive styli work with any probe system.
Q-Mark Product Spotlight for March 2018
Small Calibration Spheres
Small diameter calibration spheres are essential when qualifying small diameter styli. They allow the stylus to reach more of the sphere’s surface, giving better qualification values. They also reduce the possibility of “shanking out” the stylus during qualification. This helps reduce breakage.
Shown here are 5.0 and 8.0 mm ruby calibration spheres. They are Grade 5, serialized, and furnished with laboratory certs as to form and diameter. Their stainless steel stems have M6 threads.
We offer Grade 5 calibration spheres in diameters ranging from 5.0 mm to 30.0 mm. When qualifying small diameter tips, always use a small diameter calibration sphere.
Q-Mark Product Spotlight for February 2018
Q-MARK THREAD CARD
End the guesswork over the correct thread and ball sizes for your probe system. Our thread card has ten tapped holes between M2 and 3/8”-24 to check the thread size, and ten holes ranging from 1.0 to 6.0 mm to gage the ball size. A built-in 40 mm engraved scale confirms the stylus length. We make these from aircraft grade aluminum that is anodized and laser engraved. Protective slip cover included.
They're available at www.probe.tips. Just type "thread card" in the search box.
Q-Mark Product Spotlight for January 2018
SILICON NITRIDE BALLS
What is silicon nitride?
Silicon nitride is an extremely hard hybrid ceramic (Si3N4) with a very low coefficient of friction. It’s used in high-speed spindle bearings and aircraft flap actuators to provide longer service life in demanding environments.
Why are silicon nitride styli better than ruby styli?
When ruby balls touch soft materials - aluminum, for example - they tend to accumulate tiny bits of the material on the ball. Over time, this build-up of metal on the ball can result in measurement errors. When this happens, the stylus must be discarded.
When ruby balls are used on hard or abrasive materials, they can develop flat spots caused by wear. When a flat spot appears, the stylus must be discarded.
Silicon nitride has a significantly lower coefficient of friction than ruby. It's extremely hard, too - about 78 Rc. Therefore, silicon nitride balls exhibit less wear and don't tend to accumulate material on their surface like ruby balls. Our clients report up to 5 times longer tool life in demanding applications using silicon nitride balls instead of ruby.
Q-Mark Product Spotlight for December 2017
Ever-increasing accuracy requirements are driving probe sensor technology to higher levels of sensitivity. In many cases, this drive has reduced the amount of stylus weight that a probe sensor will tolerate. Q-Mark has responded to this need by producing a full line of ultra-light styli and stylus extensions.
In the pictures, three Q-Mark styli plus one 50 mm extension (Figure 1) weigh 4.40 grams, combined. By contrast, a newly minted nickel (Figure 2) weighs over half a gram more.
We achieve this extraordinary weight reduction by incorporating titanium and carbon fiber elements in our products. Since we do all the manufacturing and assembly, we can monitor the product weight at every step of the process. Titanium and carbon fiber offer the added benefit of very high stiffness-to-weight ratios.
If your CMM needs to go on a weight-loss campaign for the sake of accuracy, turn to Q-Mark for immediate gratification.
Q-Mark Product Spotlight for November 2017
Disk styli are used to probe interior grooves. The fascinating thing about disk styli is that there are seemingly no two alike. As part geometry varies, so do disk stylus dimensions. We get requests for custom disks, like the one pictured, nearly every day. Visit our website, www.cmms.com, and click on the tab “Design Your Own”. You’ll have it in a surprisingly short time.