Archive for May, 2009

New Tensilkut Website

May 27, 2009

Coming next week: the updated Tensilkut website at http://www.tensilkut.com !

There will be more information than ever on the Tensilkut machines and accessories, as well as new pictures.  Of course, we will continue to write articles for this blog.  Should you have questions, or something you’d like to see here, please leave a comment.  We’re happy to hear from you.

Tensilkut II in operation

Tensilkut II in operation

Advertisements

Instructions for Use of 2-Sided Template

May 19, 2009

Tensilkut two sided master templates are preferred for cutting most specimen configurations, because both sides of the sample can be cut without removing the partially completed specimen from the template.

Loosen the two socket screws on the top of the template saddles with the allen wrench provided.  The clamping bars will be free to move.  Insert your prepared specimen blank between the thin, moveable bar and the lower, fixed bar until the sample end butts up against the stop pin at one end of the template.

Tighten the two socket screws against the clamping bar with firm pressure, until the sample is secure, using the supplied allen wrench only if necessary.  Due to the unique low cutting forces involved with the Tensilkut, only moderate pressure is required to hold a sample during the machining operations.  The template is basically a holding fixture, and not a vise – excessive pressure in the socket screws could result in deformation of the template assembly.

The contour of the test specimen is controlled by the contour of the top bar of the template, which is riding along the guide sleeve of the control unit.  This guide sleeve determines the final width of the test specimen, while the master template controls the configuration of the gauge area.

Proper grip for use of Tensilkut Template

Proper grip for use of Tensilkut Template

The guide sleeve is adjusted by the micrometer dial measured in .001” divisions, with a complete revolution of the dial equal to .050”.  Turn the micrometer dial to its full out position (counterclockwise, as in unscrewing a bolt), until the stop is reached, and the indicator points to 50 on the dial.  This is the finishing position for the guide sleeve (in closest proximity to the cutting bit when a sample is completely machined).  To machine a ¾” wide sample to .500” gauge width, a total of .250” must be taken off (.125” per side).  Starting with the dial on 50 and the guide sleeve closest to the cutter, turn the dial so that the slide moves outward .125”, or a distance equal to the total amount which must be taken off that side.  With the template against the guide sleeve, the sample will just contact the cutter.  Turn the motor on with the switch located on the lower section of the motor.  Bring the left end of the contoured section of the master template containing the sample into contact with the sleeve, and with moderate hand pressure and a continuous motion, move the template across the table top in contact with the sleeve until the right end of the contoured section is reached.  Rotate the template 180 degrees, so the uncut side is closest to the cutter, and repeat this motion.  To begin the first actual contour cut of the sample, the sleeve must be moved inward an amount equal to the depth of the first machining cut.  Again, bring the left end of the contoured section of the master template in contact with the sleeve, and move the template across the table top as described above, rotate to cut the other side, and repeat until the machining of the sample is complete.  It is advisable to make the last pass no more than .001” to .003” deep, to achieve the optimum surface finish.  Please note that the sample’s finished edge will appear slightly oversized in relation to the contoured edges of the template.  The sample, when removed from the template, will have contours in accordance with the specification required.

Special Master Templates

May 15, 2009

SPECIAL MASTER TEMPLATES

Should the standard master templates we have available not suit your exact requirements, special master templates can be designed to meet almost any testing specification, including ISO, JIS, DIN, BS and EN standards.

Test specimens can be prepared from strips varying in length from 2” to 24”, and width from ¼” to 6”.  Gauge sections of the templates can be designed with or without blended tapers.  A template can include drill bushings for precision alignment of holding pin holes for elevated temperature testing or for use with certain grips.  Custom shapes have been designed for longitudinal testing of curved tube sections, while others have been built to machine specimens from welded sections.

Should your testing program require special dimensions, or if your samples include one or more of the unusual conditions listed above, please forward a sketch of the completed specimen, including tolerances and desired taper, to our Engineering Department for a quotation.  Basic sketches for tensile and tensile-impact specimens, indicating the required dimensions, are shown below.  These can be copied, and used to create a sketch of the sample for quotation, if desired.tensile sample sketch

Standard Tensilkut Templates

May 14, 2009

Because of the wide variety of specifications in use worldwide for testing of different materials, the Tensilkut machine does not include any standard templates.  All standard templates available for Tensilkut machines are listed herein, and can be ordered with the Tensilkut machine, or at a later date.  We have all standard templates in stock for immediate delivery.Temp&bits#3

To prepare a test specimen, a rough sheared or sawn strip which is the overall width of the finished specimen is inserted into the template between the upper and lower guide bars, and is not removed from the template until both sides of the specimen are completely machined.  This reduces errors caused by reversing samples, as required by conventional milling.  Where the finished specimen is too small to be held securely in a conventional two-sided template, a one-sided template is used.  A sample which requires machining along its entire length is also prepared with a one-sided template.  As with the more commonly used two-sided templates, any tapers are accurately blended into the template bars, eliminating the need for costly hand finishing.1822 template

Model Specification Gauge Size
50-14 ASTM E8 Tensile .500” x 2”
50-24 ASTM E8 Subsized Tensile .250” x 1”
50-34 ASTM E8 Subsized Tensile (Modified) .250” x 2”
50-44 ASTM D638 Type I .500” x 2”
50-52 ASTM D638 Type II .250” x 2”
50-57 ASTM D638 Type III .750” x 2.25”
50-62 ASTM D1622 Type S Tensile Impact .125” x .500”R
50-67 ASTM D1622 Type L Tensile Impact .125” x .375”
50-72 ASTM D790 Flexural .500” wide x 4”-8” long
50-77 ASTM D790 Flexural 1.000” wide x 4”-8” long
50-82 ASTM D695 Compression Gauge Section: .500”x1.5”
50-87 ASTM D695 Compression To Square Ends: 3.13”
50-92 ASTM D412 Die C .250” x 2.32”
50-97 ASTM D412 Die D .125” x 1.31”

Please call or email for a quotation on the template you need.