THESIS

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AUSTIN EDWARD FORD

1917
 

 
Copy I,

THESIS

 

 
The Designs of a Portable liotor Driven Saw Table

and a Laboratory Lifting Crane.

A Thesis Submitted to
The Faculty of

MICHIGAN AGRICULTURAL COLLEGE.

By

Austin Edward Ford.

Candidate for the Degree of

Bachelor of Science.

June 1917.
JMESIS

Gov. |

 
Table of Contents.

Preface.
Abbreviations.
Discussion.
Bibolography.
Outline of Drawings.
Bill of iaterial.

3304

Page.

t

1.

Qe

5-7 incl.
8.

9.
10-11.
(1).

Preface.

The object of these designs, as intended by the
author was for tha purpose of supplying to the electrical
department, a new machine, to be used in its work shops or
laboratories. Since the disasterous fire, way 5, 1916, which
destroyed the engineering department from its buildings on
the campus. The author selected this particular design,
which would be the most needed by the above department. The
S&uthor choose this design in the hopes of giving a great
deal of practical work to the department. It is alse hoped
that the designed apparatus, if built by the electrical da-
partment in the next year or so will be of very great help
to graduates, under-graduates, or to any person who should
at any time come in to make use of it in their work. The
author wishes to thank Mr. H. G. Crane of Brookline, Mass.
and show his appreciation of the many things that the author
was able to get from his descriptive folder in regard to this
design. An also, the author wishes to thank Professor A. R.
Sawyer for the help that was given and the suggestions that

were offered from time to time during the design.

A. E. Ford.
(2).

Abbreviations.

Cast Iron. - Cc. I.
Steel. " 5.
Pieces. ScoPos.
Threads. "  Thds.
Finish. " f.

U. De Standard. " U. Se ot.

Babbit. " Bab.
Inches. ,
Feet. "

Radius. " kor r.
(3).
Discussion.

Portable ‘iotor Driven Saw Table. It might be said
that the design of

the first or possibly the earliest piece of apparatus, con-
sisting chiefly of perhaps at its earliest stage was done a
long time ago. The time that this was done, would perhaps be
very indefinite as to the exact date, therefore the date of
beginning will be omitted. The next designs would according
to the present ideas and development, would be more complex,
that is, they would require more skill and be more difficult
to be made by the crude machinery of that time. So that from
time to time until the present date, the design of any new
apparatus, depends upon the conitions that existed at that
time. Then it is safe to say that as the design become more
complex, the machinery used to produc certain machines aiso
become more difficult. While to-day, a design uses all the
knowledge that is available to him, in doing his work,
whether done from good results of the past that might have
been seen or any new idea that might be possible to be used
to reduce the labor and cost.

Then the design of any piece of apparatus for use by
any person or persons takes into consideration the following

points: a). Least weight, b). Small size, c). “iost economical

in cost, ad). Best material in construction, and e). Neat in

appearance of the finished product. In designing any piece of
(4).
apparatus, the first thing to be done is to study of the
Methods and manners in which it was to be done, that is,
the drawing which are to be made and the arrangement of the
parts either sssembled together or parts in detail on the
drawing sheets.

The dgawings which were made in this particular design
consists of five plates or sheets. They were divided chiefly
into two main or primary divisions, the assembled drawings
and the detailed drawings. The latter consisted of the detail-
drawings of each part with dimensions, or namely the following
detailed parts, top, frame, motor frame holder, saw arbor,
mitre guide, stationery guide, saw arbor bearings, stationery
guide bracket and adjusting screw. The details consists of the
Most important to the least imvnortent parts of the design
Whether smfll or large in size, or the number needed.

In the working up of the design, the designer made the
parts of every detail as nearly standard in size, as regards
to good judgement as to the size of the parts required.The
parts of the design are found upon the plates eas listed below:

Plate 1. - Assembled Drawing.

Plate 2. - Detailed Drawing showing top and hinge rod
details.

Plate 3. - Detailed Lrawing showing frame details.

Plate 4. - Detailed Drawing showing bearings, shaft,

pulley, saw arbor, mitre guide, mitre guide block, stationery
(5).

guide, and various sizes of bolts and nuts.

PlatesS. - Detailed Drawing showing motor frame holder
and adjusting screw.

Since the design of the this piece of apparatus is so
Small, it is to be placed upon the work bench and used there
entirely. The over-all dimensions of the portable motor
driven saw table sre top table size, twelve inches iogg and
sixteen inches wide and sixtecn inches high, with maximum
diameter of saw equal to six inches, using a@ one and one
quarter inch leather belt drive between shaft and electric
Motor. The approximate weight of the complete assembled design
including motor of not larger than one quarter horse power
will be eighty pounds.

Guides are quickly and easily adjusted. The mitre or
commonly called the cut-off guide is adjustable to any angle
for mitre sawing, lubrication, by means of prease and oil cups
requires very little attention on the part of the operator.
Specéal saws for sawing electrotype, soft metals, and for
other purposes, are easily procured at reasonable prices.

The bearings of the motor and the saw arbor are made of
Special alloy, and if necessary at any time, due to careless;
ness of the operator of not oiling them once in a: while, they
can be replaced at low cost. The tension on the belt is
easily regulated by an adjusting screw. For grooving or

slotting, the table top may be raised or lowered by means of
(6).

an adjusting screw as shown on plate 5. The lower part or
frame is in one casting making it very rigid. The top is
planned smooth and true and all part are carefully fitted,
making the complete design when assembled very durable and
an accurate machine.

The design made an allowance for any size motor for
driving that is to be used as motive power as large as one
quarter horse power of General Electric Company make with the
following over-all dimensions: length - eleven inches, width -
seven inches and height - seven and five-eighth inches. Also
provided that an electric motor either 110 or 220 volts ( D.
C.) Direct Current of special design, that is enclosed and
dust and dirt proof be only used. It will have sufficient
power to drive the saw through hard wood with ease. Each
Motor is supplied with approximately twelve feet of cord with
an attachment plug on the other end so that it can be connected
in a lamp socket near the work bemch. Cost of operation is
about 2.5 cents an hour ( with 10 cents K. W. H. rate).

The use of this apparatus is unlimited and a large num-
ber of manufacturera are using them. The list below shows its
usefulness and adaptability to various requirements.

Printers: Sawing electrotyps, cuts and linotype.
Organ 2ulilders; Miaking cleats, sawing moulding, etc.

“lectgBical ltifgrs: Sawing carbo blocks.

iiusical Instrument ifgrs: Sawine brass tubes.
(7).

Shoe iiachine Co.: Pattern work.

Craftsmen: Yood and brass sawing.

Camera HKepairers: Wood and brass sawing.

Optical Instrument Co.: Brass sawing.

Decorating Co.¥ Sawing slats, etc.

Educational Institutions: General work, manual training.

Box lifgrs.: Pattern makers and others.

Laboratory Lifting Crane. The desi-n of the lifting

crane which could be used

in either the alternating or direct current laboratories and
to be guided by the beam over head which was of reinforced

concrete. The crane must be made strong enough to be ablecto
lift a maximum load of twelve hundred pounds. It is to have
& base which has four wheels and can be moved about easily.

One drum upon which the cable for lifting is fastened on the

side of the crane standard with brackets. The crane standard

is to be square and hollow and made of wood. Plates 6 and on

show the details of this crane.
(8).

Bibolosraphy.

iarshall's Elementary Xechine Drawing and Design.

( 1912 Edition. )

Bolts and nuts sizes. - Page 9.
luethod. " ele-44 incl.
Bolts sizes. " 85.
Ying nuts. " 87.
Bearings. " 119.

Kent's Mechanical Zngineers Pocket Book ( 1916 Edition ).

U. S. Standard Threads. - Page 231.
(9).

Outline of Drawings.

4). Assembled Drawing.

Plate 1.

- assembled darwing.

B). Detailed Drawin:s.

Plate 2.
Plate 3.
Plate 4.
Plate 5.

- Top details and hinge rod details.

Frame details.

Accessory parts details.

iotor frame holder details and adjusting

screw details.
(10).

Bill of iwaterial.

Name of Part. Material. Length. No. Pes.
Top of Table. C. I. i.
Frame. C. I. 1.
Stationery Guide. Cc. I. 1.
liitre Suide. C. I. 1.
Stationery Guide Bracket. Cc. I. 1.
Bearing Wo. l. C. I. 1.
Bearing No. 2&2. C. I. 1.
Saw Arbor (shaft). Ss. 1.
Crown Pulley. C. I. 1.
Hexagonal Nut ( 3/4" ). Cc. I. 1.
Washer. ( 3/4" ), Cc. I. 1.
Mitre Guide Block. C. I. 1.
Wing Nut ( 1/4" ). Cc. I. 1.
Hexagonal Nut. ( 1/4" ). Cc. I. 1.
Hexagonal Bolt. ( 1/4" ). Cc. I. 1.
Hexagonal Bolts. ( 3/8" ). Cc. I. 2.
Top Bolts and Nuts ( 1/4" ). Cc. I. ( 13"), 1.
Top Nuts. ( 1/4" ). Cc. I. 2.
Hexagonal Bolt. ( 1/4" ). Cc. I. ( 13"). 2,
Hexagonal Nut. ( 1/4" ). c. I. 2.
Hexagonal Screws. ( 1/4" ). Cc. I. ( 3/4" ). 2,
Hexagonal Bolt. ( 1/4" ).
Hexagonal Nut. ( 1/4" ).

1/4"
1/4"
1/4"
1/4"

Name of Part.

Screw.
Block.
Handle.

nod.

(11).

Material.

I.

Length. MWNo.
( 5/e" ).
( 9" ),

( 11 3/4" ).

Pes.

1.
1.
1.
be

1.

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ROOM USE ONLY
ROOM Use ONLY

 

 
 
   

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