UL RP 3002-2017 UL Standard for Safety Determining Depth of Cut On a Test Probe Contacting the Spinning Blade of a Table Saw (First Edition).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL RP 3002 Recommended Practice for Determining the Depth of Cut On a Test Probe Contacting the Spinning Blade of a Table Saw STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTH

2、ER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Recommended Practice for Determining the Depth of Cut On a Test Probe Contacting the Spinning Blade of a Table Saw, UL RP 3002 First Ed

3、ition, Dated July 13, 2017 Summary of Topics This Recommended Practice for Determining Depth of Cut On a Test Probe Contacting the Spinning Blade of a Table Saw, UL RP 3002, provides a test procedure for determining the depth of cut on a test probe after the test probe comes into contact with the sp

4、inning blade of a table saw. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Recommended Practice “

5、as is” without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost sav

6、ings, loss of data, or any other damages arising out of the use of or the inability to use this Recommended Practice, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this R

7、ecommended Practice, regardless of the form of the claim. Users of the electronic versions of ULs Recommended Practices agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any

8、error or deviation introduced while purchaser is storing an electronic Recommended Practice on the purchasers computer system. JULY 13, 2017 UL RP 3002 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 13, 2017 UL RP 3002 tr2 No Text o

9、n This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 13, 2017 1 UL RP 3002 Recommended Practice for Determining the Depth of Cut On a Test Probe Contacting the Spinning Blade of a Table Saw First Edition July 13, 2017 This Recomme

10、nded Practice provides a set of instructions for performing one or more specic operations. This Recommended Practice contains only non-mandatory provisions. ULs Recommended Practices are copyrighted by UL. Neither a printed nor electronic copy of a Recommended Practice should be altered in any way.

11、All of ULs Recommended Practices and all copyrights, ownerships and rights regarding those Recommended Practices shall remain the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PE

12、RMISSION FROM UL JULY 13, 2017 UL RP 3002 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS ABSTRACT INTRODUCTION 1 Scope .4 2 Referenced Documents 4 3 Signicance And Use 5 PERFORMANCE 4 Table Saw Sample Preparat

13、ion .5 5 Laboratory Test Apparatus .5 6 Pre-conditioning 9 7 Test Preparation .10 8 Test Procedure 12 9 Measurement of Depth of Cut .13 10 Report .14 JULY 13, 2017 UL RP 3002 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ABSTRACT The US C

14、onsumer Product Safety Commission (CPSC) published a Notice of Proposed Rulemaking for a “Safety Standard for Blade-Contact Injuries on Table Saws” (proposed 16 CFR Part 1245), which includes information related to reducing the risk of injury associated with blade-contact injuries on table saws. Thi

15、s Recommended Practice provides the details of a test procedure that can be used to repeatedly and reliably determine the depth of cut on the test probe. The source of these details is based upon a test procedure originally developed by UL LLC from which a later test procedure cited by CPSC staff in

16、 their January 17, 2017 brieng package was based. The Recommended Practice assumes a spinning saw blade and is not intended for determining depth of cut due to contact with a non-spinning saw blade. INTRODUCTION 1 Scope 1.1 This Recommended Practice provides a test procedure for determining the dept

17、h of cut on a test probe after the test probe comes into contact with the spinning blade of a table saw. 2 Referenced Documents US CPSC Notice of Proposed Rulemaking Safety Standard Addressing Blade-Contact Injuries on Table Saws 1 1 US Federal Register / Vol. 82, No. 91 / Friday, May 12, 2017, page

18、s 22190-22247. Staff Brieng Package for Proposed Performance Requirements to Address Blade-contact Injuries on Table Saws 2 2 US CPSC Staff Brieng Package for Proposed Performance Requirements to Address Blade-contact Injuries on Table Saws, Tab A, Section II.E.1.a, https:/www.cpsc.gov/s3fs-public/P

19、roposed%20Rule%20-%20Safety%20Standard%20for%20Blade- Contact%20Injuries%20on%20Table%20Saws%20-%20January%2017%202017.pdf ASTM ASTM D 618 Standard Practice for Conditioning Plastics for Testing JULY 13, 2017 UL RP 3002 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION

20、 WITHOUT PERMISSION FROM UL 3 Signicance And Use 3.1 Table saws with an integral injury mitigation system that responds to a change in capacitance due to spinning blade contact are addressed by the test procedure described herein. Mitigation means not responsive to capacitive contact, non-contact mi

21、tigation means and non-spinning blade contact are not addressed. 3.2 The test procedure species the mechanical and electrical criteria necessary for repeatable and reliable means of blade contact and depth of cut measurement. PERFORMANCE 4 Table Saw Sample Preparation 4.1 A table saw test sample is

22、assembled per the manufacturers instructions with the exception of the blade guard system. The blade guard system is removed for all tests. 4.2 The manufacturers recommended saw blade(s) are used for all tests. 4.3 One table saw is used for all tests. However, a table saw test sample or part thereof

23、 may be replaced with a new sample or part if the original becomes unusable. 5 Laboratory Test Apparatus 5.1 The laboratory test apparatus consists of the following: a) Linear actuator 3 with a minimum travel distance of 500 mm and a travel speed up to 2 m/sec; b) Human body network (HBN) consisting

24、 of a circuit of resistor and capacitor values and conguration as shown in Figure 5.1. Note that Cs capacitance values vary as specied in 7.4; This is generated text for gtxt. JULY 13, 2017 UL RP 3002 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

25、 FROM UL Figure 5.1 Human body network (HBN) JULY 13, 2017 UL RP 3002 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL c) Test probe composed of material type and properties of Item (1) and dimensions of Item (2), shaped as shown in Figure 5

26、.2; 1) Material: Low-resistance, conductive silicone rubber 4 having a volume resistivity of 10 -cm and a minimum bending rigidity of 70 kN/m at room ambient; 2) Dimensions: 12.5 0.5 mm x 12.5 0.5 mm x 60 1.0 mm homogenous block; This is generated text for gtxt. d) Probe holder composed of material

27、type of Item (1) and dimensions of Item (2), shaped as shown as shown in Figure 5.3; 1) Material: Rigid non-conductive plastic; 2) Dimensions: Figure 5.2 Test probe JULY 13, 2017 UL RP 3002 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Ta

28、ble 5.1 Probe holder dimensions Key Dimension (mm) a 47.5 1 b1 0 1 c 12.5 0.1 d5 0.5 e6 0 1 This is generated text for gtxt. e) Probe stabilizer strip composed of material type of Item (1) and dimensions of Item (2), shaped as shown in Figure 5.4; 1) Material: Impact-resistant ultra-high molecular w

29、eight (UHMW) polyethylene sheet cut into a strip; 2) Dimensions: 12.5 0.5 mm x 3.0 0.25 mm x 60 1.0 mm. This is generated text for gtxt. Figure 5.3 Probe holder JULY 13, 2017 UL RP 3002 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Voya

30、ger VB1 Belt Actuator and Voyager Series VB1 Belt Slide manufactured by Isel USA Inc., or equivalent. 4 Stockwell Elastomers, Inc., part number SE65-CON, or equivalent. 6 Pre-conditioning 6.1 The table saw under test is at room temperature. 6.2 Tests are made in a draft-free location at an ambient a

31、ir temperature of (20 5)C with a relative humidity of 50 10 percent. 6.3 The test probe is preconditioned in accordance with ASTM D 618 at 23 2C and 50 10 percent relative humidity for a minimum of 48 hours. 6.4 Once removed from the pre-conditioning environment, specimens shall be tested within 30

32、minutes. Figure 5.4 Probe stabilizer strip JULY 13, 2017 UL RP 3002 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Test Preparation 7.1 A test probe is placed in the probe holder such that it extends 12.5 1 mm past one edge of the holder

33、. It rests atop of the probe stabilizer strip for its entire length as shown in Figure 7.1. This is generated text for gtxt. 7.2 The test probe assembly is attached to the linear actuator and placed on the table saw work surface such that the test probe is oriented horizontal to the table saw work s

34、urface and perpendicular to the saw blade 5 . The test probe assembly is laterally positioned such that, when advanced toward the saw blade, the exposed section of the test probe is approximately centered on the blade. (See Figure 7.2). 5 If the test probe assembly is correctly assembled, the center

35、 axis of the test probe will be 15 2 mm above the table saw work surface on which it is placed. This is generated text for gtxt. Figure 7.1 Test probe assembly JULY 13, 2017 UL RP 3002 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7.3 Th

36、e test sample is connected to earth ground by the grounding conductor of its power supply cord or, if a double-insulated construction, by connecting the work surface and table saw frame to earth ground by any convenient means. 7.4 The HBN is connected to the test probe by a nominal 5 cm length of 22

37、-26 AWG solid copper wire, as shown in Figure 7.3. The HBN variable capacitance values of Cs are: 50 pF, 66 pF, 100 pF, 200 pF and a short circuit. This is generated text for gtxt. Figure 7.2 Probe assembly orientation JULY 13, 2017 UL RP 3002 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP

38、RODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7.5 The linear actuator is programed to advance the test probe assembly toward the saw blade at a rate of 1 m/s. The linear travel distance is not specied except that it permits the test probe to fully contact the saw blade and doesnt inuence the

39、depth of cut measurement. 8 Test Procedure 8.1 The test procedure is as follows: a) Set the table saw blade to its maximum height and 0 degree bevel with respect to the work surface; b) Set the HBN variable capacitance (Cs) to 50 pF; c) Connect the table saw to an electrical supply providing the nom

40、inal nameplate voltage of the test sample and turn on the table saw, allowing any control or injury mitigation systems to initialize and ready the saw for cutting work pieces; d) Operate the saw blade via the appropriate table saw switch and allow the saw blade to attain its normal rotation speed; e

41、) Advance the test probe towards the spinning saw blade via the linear actuator at the programmed rate of speed; f) Once contact with the saw blade is made, allow the advancing test probe assembly to come to rest; Figure 7.3 HBN connection JULY 13, 2017 UL RP 3002 12UL COPYRIGHTED MATERIAL NOT AUTHO

42、RIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL g) Turn off power to the table saw and remove the test probe 6 for inspection and depth of cut measurement. 6 It is expected that the table saw injury mitigation system will cause the saw blade to stop its rotation. Care shall

43、 be exercised in handling of the test probe and test probe assembly until it is clear that moving parts of the table saw have ceased their movement. 8.2 After performing the depth of cut measurement, repeat 7.1 with the HBN capacitance (Cs) set to 66 pF. Continue repeating 7.1, each time setting Cs

44、to the next capacitance value in the sequence cited in 7.4, concluding with the test where Cs is a short circuit. 9 Measurement of Depth of Cut 9.1 Depth of cut (D) is determined by measuring, via any convenient means, the external horizontal (X) and vertical (Y) cuts on the probe to the nearest 0.1

45、 mm as shown in Figure 9.1. This is generated text for gtxt. 9.2 The measurements are entered in Equation 1 to obtain the value of depth of cut (D). Equation 1:D=X Y/(X 2 +Y 2 ) 1/2 Figure 9.1 X and Y measurements to determine depth of cut JULY 13, 2017 UL RP 3002 13UL COPYRIGHTED MATERIAL NOT AUTHO

46、RIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 10 Report 10.1 Report the following information: a) Manufacturers name and model number of the table saw; b) Details on each blade used for tests, including; 1) Catalog number or blade type (e.g. ripping); 2) Diameter; and 3) Number of teeth for each blade tested; c) Measured distance X in mm; d) Measured distance Y in mm; and e) Calculated Depth of Cut (D) in mm. JULY 13, 2017 UL RP 3002 14UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL