Drill Jigs Principles of Design Machinery ... - Evenfall Studios

54 No. 3 DRILL JIGS
In the following outline of a system for getting the most out of
the tools in the shop, the word "jig" will be meant to include all jigs,
templets, fixtures, appliances, etc., which aid in the rapid and accurate
machining of parts. With such assumptions allowed, the necessity for
some systematic scheme of management for the use and care of the
jigs should be apparent. However, it is not uncommon, even in these
days, when the jig is admittedly one of the main factors instrumental
in developing the shops of the past (where machinery was "built"),
into the shops of the present (where it is "manufactured"), to find concerns
where the jigs are given no consideration beyond designing them
and keeping them in a questionable state of repair. The whole tool
or jig scheme, however, is so interwoven with the entire shop that
the success of a system cannot be dependent entirely upon any one
person, but upon the co-operation of all.
DRILLING JIG SET-F 42 C.
4 THUMB NUTS
2 SET SCREWS
TWI8T DRILLS-
I- 10 THREAD MACHINE
REAMER t* MACHINE
TAPER -SPECIAL NO. F 39
Fig. 66. List of Parts of Jig,
and. Tools used -with same
DRILLING OPERATION SHEET F 42 C.
REVERSE LID AND
TAP 6 /a- 10 THREADS
REAM K'SPEC. NO. F 39
NOTE:- CARE MUST BE TAKEN THAT CHIPS DO
NOT ACCUMULATE IN CORNERS OF JIG.
NOTE:- DO NOT TIGHTEN TOO MUCH ON SET
SCREWS AS THERE IS DANGER OF SPRINGING
WORK.
Fig. 67. List of Operations
to be performed
The tool foreman is the one, after the management, who contributes
most to either success or failure, and therefore his selection should be
made with care. This tool foreman, as we prefer to call him, is to the
modern shop what the head toolmaker was to the old-time shop, and
his increased duties and responsibilities entitle him to the new title.
He should possess executive as well as mechanical ability, and be broadminded
and up-to-date, for to him should be intrusted the tooling of
the machines, the design, manufacture and care of the jigs, the complete
control of the tool-room and the enforcement of any system the
management may inaugurate. He will, however, be doomed to only
partial success, if not absolute failure, without a tool-room system.
Suitable methods should prevail in the tool-room, or better, in the
jig-room, whereby a workman when receiving a jig gets all the neces-
sary tools to perform all the operations upon the piece that the jig
is designed to do. It should not be necessary for him to ask for the
tools separately, but simply to ask for the jig and tools for such or
such an operation, designated either by name or number preferably
by number and have them delivered to him -complete. By doing this,
much time will be saved, and mistakes will often be avoided. This can