EXPERIMENTS ON DRILLING BORE HOLES WITH EKM-1 ELECTRIC CORE DRILLS IN SOVIET BAUXITE MINES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000700040096-0
• Release Decision: RIPPUB
• Original Classification: R
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: October 28, 2011
• Sequence Number: 96
• Publication Date: January 25, 1952
• Content Type: REPORT

Declassified in Part - Sanitized Copy Approved for Release 2011/10/31
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SECURITY INFORMATIGN
.CENTRAL INTELLIGENCE AGENCY RE
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO 9ROADCASTS CD
SUBJECT Economic - Mining, nonferrous metals
HOW
PUBLISHED Monthly periodical
WHERE
PUBLISHED Moscow
DATE
PUBLISHED Jul 1951
LANGUAGE. Russian
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STAT
DATE ;1F
INFORMATION 1950
DATE DIST. .`~bl Jan 1952
SUPPLEMENT TO
REPORT NO.
EXPERIMENTS ON DRILLING BORE HOLES
WITH EISM-1 ELECTRIC CORE DRILLS IN SOVIET BAUXITE bLI1~5
Until recently, drilling of bore holes at the Severoural'sk?batuclte mines
was done only by pneumatic Fammers. In 1950, experiments were made in these
mines with EIQf-1 electric ..ore drills, designed by Prof V. G. Mikhaylov.
EKM-1 electric drills have moi,ors with a power of 2.5 kilowatts, and the
speed of the spindle can be varied between 155 and 1,500 revolutions per minute,
with the feed of the spindle per revolution varying between 0.6 and 7.5 millime-
ters
For these experiments twist drills were used with a length of 0.5 to 3
meters, a rhombic section of 35 x 18 millimeters, the boring bars being made of
U-7 steel. utandard type No 3 cutters were used, reinforced with VK-8 hard
alloy. In addition, chisel-shaped cutteFS wex?e used.
The experiments were carried out in shaft No 4 of Northern Mine No 2.
Holes were drilled both in rock (limestone) and in bauxite ore of various
types. The ?ollowing table. gives a deacript:.on of the kinds of rock and the
volume o? work performed:
Tyke of Rock
Monolithic, light grey
Total Length
(m) _
limestone
8
18
4
0
Red bauxite ore (
cr
ude ore)
5
48
11
5
Same
4-5
65
13
5
Flagstone, Jasper
bauxite ore
-t
ype
6-7
14
2
0
Total
--
145
31
0
RESTR~CT,~~
Declassified in Part - Sanitized Copy Approved for Release 2011/10/31
CIA-RDP80-00809A000700040096-0
 Declassified in Part - Sanitized Copy Approved for Release 2011/10/31
STAT
RESTRiC~i~t~
RESTRICTID
The following table gives deta on carious methods of drilling:
Tested Methods ..
Spindle
Feed per
Revolution
Spee
d
of Feed
~
,~
208
o.b
125
208
1.32
275
208
0.6
125
270
0.6
162
~
1.32
275
208
1.32
7
270
1.32
357
Type of Rock
Total Length
of Drilled
Bore Holes
(m)
Limestone
g
Same
32
Net, red bauxite ore
40
Same
75
Wet and dry red bauxite ore
1*
Flagstone, gasper-type
135
bauxite ore
12
Seine
g
* The top figure gives the depth of holes in wet ore; the lower figure, for
dry ore.
The table below shows the speed of drilling holes with electric drills and
pneumatic drilling harmnei?s:
Type of Rock
Wet red ore
Flagstone, frozen ore
Dry red ore
Limestone
Electric Drilling
Pneumatic DriL'ing
(mm/min)
(mm/min)
120
76
200
64
240
42
210
49
The experiments have shorn the expediency of using EISM-1 electrlc drills
instead of pneumatic drilling hammers in the Severoural'ek bauxite mines.
RES ~ R{CTED
Declassified in Part - Sanitized Copy Approved for Release 2011/10/31
CIA-RDP80-00809A000700040096-0