JIS T5210:1985 pdfダウンロード

JIS T5210:1985 pdfダウンロード。Dental Carborundum Points
Scope
This Japanese Industrial Standard specifies the dental carborundum points,hereinafter referred to as the “points”
The units and numerical values given in { }in this standardRemark:are in accordance with the conventional units, and are appendedfor informative reference.
Qualities
The point shall have correct profile, and be free from2.1Appearanceflaws,cracks，flashes,rusts，and other defects.
2.2 EccentricityThe eccentricity of the point head, when subjected tothe test in 5,2, shall be 0,3 mm or under in its amount of eccentricity.
2.3 Falling Off When subjected to the test in 5.3, the point head shallnot fall off from the shank during operation.
When subjected to the test in 5.4,the specific ground2.4Sharpnessvolume shall be 020 or over.
Shapes and Dimensions for Shanks3
The shapes and dimensions for shanks shall be in accordance with AttachedFigure and Attached Table.
4.Materials
4.1 Point Head (Cutting Edge) The material of the point head shallgenerally be the silicon carbide abrasive specified in JIS R 6111.
4.2 Shank (Shaft)The material of the shank shall generally be theSWRM 10，12,15，17,20 and 22 specified in JIS G 3505,and shall not easilygenerate rust while storage.
5. Inspections and Testing Methods
Appearance InspectionThe appearance inspection shall be carried5.1out by visual inspection.
5.2 Eccentricity Inspection The eccentricity inspection shall be carriedout in accordance with either one of the following two methods.
(1) Measure the maximum value of run-out, rotating the shank of thepoint in the picture of a projector.
(Place the shank of the point on a precisely finished V block, applythe gauge head of the dial gauge of 0.01 mm scale mark to the pointhead, rotate the shank of the point quietly, and measure the maximumvalue of the run-out of the dial gauge.
5.3 Falling Off TestUsing the point for testing of the wheel shape ofapproximately 13 mm in diameter and approximately 1,6 mm in thickness, usethe soda lime glass of 3 mm thick in accordance with 5.2 of JIS T 5209, asappropriate, apply a contact load of 3.9 N (400 gf) for 2 min, and carry outgrinding (dry grinding). However, in this case, the piece to be ground shallnot be formed in advance.
5.4Sharpness testThe sharpness test shall be carried out in accordancewith 5.2 of JIS T 5209,as appropriate.In this case the point shall be thepoint for testing of 5. 3.
6.Designation
The product shall be designated by the name.Example: Dental carborundum point
1.Marking
On the surface of the package, the following information shall be marked;
(1)Name
Manufacturing number or its symbol(2)
(3)Manufacturer’s name and address