Offset homework and quiz

complete the following assignment.  questions 1-8 counts as one shop homework grade.  questions 9-14 counts as a second shop homework grade.  questions 15-20 count as a shop quiz grade. this assignment is due Friday February 27, 2015.

Use the following formula to calculate offset location:

       “A”=D-[(H x M1) + C]    Given:  ½” EMT   Angle =30 degrees  D= 24”  H=8” 

    M1=1.00  C= 5”

1.  Mark A=  ____________     2.   Mark B=  _____________

Given:   ¾” EMT      Angle= 45 degrees   D= 39 ½”  H= 4”   M1= 1.73   C= 5 ½”

3.   Mark A= ____________     4.   Mark B= ______________

Given:  ½”  EMT   Angle= 45 degrees D=26”   H= 10”  M1=1.73   C= 5”

5        Mark A = ______________  6.  Mark B = ______________

Given:  ¾”  EMT   Angle 30 degrees     D= 31 “  H=7”  M1-1.00  C=  5 ½”

7.  Mark A= _____________     8.  Mark B = ________________

Use the following formula to calculate offset location:

     B=D + ( H x Sv )    Given:   ½” EMT  Angle= 30 degrees H= 8” Sv= ¼”

9.  Mark B= _____________   10.  Mark A = _____________

Given:  1” EMT  Angle = 45 degrees   H = 4”  Sv= 3/8”

11.  Mark B=  _____________  12.  Mark A= ______________

Given:  ¾” EMT  Angle = 30 degrees  H=14”  Sv=1/4”

13.  Mark B= _____________       14.  Mark A = ______________

Calculate marks A2, A3 and B1 ( or B2 or B3 ) for the following parallel offset problems:

Adjustment= S x T    S = spacing  T = tangent for ½ of offset angle

Given:  1” EMT  Angle= 30 degrees  H= 4”  S= 4.163”  T= .2679

15.  Mark A2= ________   16.  Mark A3= __________  17.  Mark B1= _________

Given:   1” EMT  Angle= 30 degrees  H= 6”  S= 4.163”  T= .2679

18.  Mark A2= ________  19.  Mark A3= __________  20.  Mark B1= _________

90 degree pipe bending chart

please read chart carefully.  the first number given is for the 90 degree bend.  the second number is for the leg.  also note the rubric for scoring.

NAME	90	KICK	BOX	OFFSET	3-BEND	4-BEND
	11” x 20 1/4”
	13” x 17 ¼”
	16” x 20 3/4”
	12” x 15 ½”
	14” x 16 ¼”
	15” x 19 ½”
	13” x 18 ¾”
	12” x 22 ¼”
	20” x 23 ¼”
	11” x 16 ¾”
	14” x 20 ¼”
	15” x 21 ½”
	10” x 16 ¾”
	13” x 20 ¾”
	14” x 21 ¼”
	18” x 24 ¼”
	16” x 23 ½”
	15” x  20 ¼”
	16”x 18”
	17” x 19”
	20” x 20”

RUBRICS:   90:                   25 points each for tools/safety, measurement, plumb, reamed.

Trig link 1/30/15

http://www.mathsisfun.com/sine-cosine-tangent.html

Pythagorean theory help

same link as before, but a different lesson. 

http://www.mathwarehouse.com/geometry/triangles/how-to-use-the-pythagorean-theorem.php

Help with trig word problems

I found a link that may prove helpful to those of you having difficulties solving word problems.

http://www.mathwarehouse.com/trigonometry/sohcahtoa-real-world-applications.php

Transformer Proportion Formulas

use these formulas to solve the assignment in class Monday.



FOR DIRECT PROPORTION RATIOS     TURNS and VOLTAGE


N p    =  E p
N s           E s


FOR INVERSE PROPORTION RATIOS  VOLTS and AMPS

E p = I s
Es            I p

Transformer Taps

this is from ACME electric, a transformer manufacturer.

What are taps and when are they used?

Taps are provided on some transformers on the high voltage winding to correct for high or low voltage conditions, and still deliver full rated output voltages at the secondary terminals.
Standard tap arrangements are at 2.5%and 5% of the rated primary voltage for both high and low voltage conditions.
For example, if the transformer has a 480 volt primary and the available line voltage is running at 504 volts, the primary should be connected to the 5% tap above normal in order that the secondary voltage be maintained at the proper rating.
The standard ASA and NEMA designation for taps are “ANFC” (above normal full capacity) and “BNFC” (below normal full capacity).