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MACHINE TOOL CO.
ijW. cinuja c hirers oj*
CABLE ADDRESS "CARLTO N"
CINCINNATI,
U. S. A.
OHIO
RADIAL DRILLS
RECEIVED
J f. OWENS MACHINERY CO.
FEB 1 1949
January 25, 194?
COMPARISON
At the Machine Tool Show in IS
Introduced a machine which was a radical departure from what we accept
as a standard radial drill.
drill „
The arm Is of fixed helghth and it is mounted on a column that is 12"
in diameter at the lower end and ££;■" in diameter at the top where the arm
is mounted. The arm will swing 360 degrees. The table moves uo and down
the
l?'
1 column and can be swung 360 degrees also. This machine has been
advertised extensively in all of the trade magazines.
OF FOSDICK RADIAL DRILLS
4? the Fosdick Machine Tool Co.
They call this machine a sensitive radial
ANSWERED...
FILED
REFER TO _
__
•>
The machine is ecmipoed with nine spindle speeds with a 20 to 1 speed
ratio,
?500
ranging from „004 to .020 or .002 to .010.
The speeds range from 60 to 1200* 75
c I50 So' 3000 and 175 to 3500.
1500, 100 to 2000, 125
Two selections of feeds are offered,
The capacity of the spindle
driving motor is 3 horseoower, and the spindle is reversed electrically
by this motor. The driving diameter of the spindle is 1 1/4" and the
snlndle nose is 2" in diameter. The spindle sleeve is 2 7/S". There is
a No. 4 Morse Taper in the spindle. The drive is similar to that of their
larger machines where the power is transmitted to the drill from the top of
the spindle.
The helghth of the machine from the floor to the top of the column is
SO". The helghth of the machine from the floor to the top of the head is
95". The lenghth of the arm bearing of the head is 12 3/4". The net weight
of the y- io 4500 lbs. and the net weight of the 4" machlhs is 4900 lbs
The net price of the machine is about 10/5 lower than our QA models, with
a '":275<>
00 extra charge for power elevation to the table.
To make a comparison of this machine with one of our models In the
o o
same price range we shall use our OA model which you are all familiar with.
From an operational standpoint we believe there Is a decided advantage for
our machine. If you will note the helghth of the Fosdick machine you will
find that it is SO
range from about 64" to over SO" high, The too of the head being 95" from
51 from the floor to the top of the column. The controls
the floor. With the controls placed at this helghth, the average sf^e man
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will hnve to work wi th his hands at the same level or higher than his face*
Working In this position all day long ean be very tiresome*
photos in the magazines show an operator standing In front of the machine
One of the
with the table at the same level as his chest* In this position the operator
will be in danger of being hit in the face., neok, or chest with hot chips
flying all over when drilling at high speeds.
We further believe that this machine will not handle any of the Jobs
that are too large for the table and yet not high enough to drill
properly
from the base. The fact that there are two revolving parts on this m
chine,
the table and the arm, plus the comparatively thin flange at the bottom of
the column whioh is bolted to the base, makes this design look as though
it would not be as rigid as the Carlton OA model. The 12" diameter column
actually does not withstand the entire thrust load due to drilling, remem
bering that the arm is mounted on that portion of the column that is only
£>-a
H in diameter*
Another point that you are familiar with is our low hung drive versus
the drive at the top of the spindle. As we have already mentioned, the
driving diameter on the Fosdick is lo‘! in diameter* This is one half os
the driving diameter that is used on the Carlton OA Spindle.
The design of the Fosdick head is such that a tapered gib is necessary
alonr xA th the ball bearings that ride on a hardened wear strip* This
means that the machine will require more freruent and exacting adjustment
than the Carlton machine reaulres.
Carlton is 15
the Fosdick machine is not well balanced on the arm and unless the
on
” in comparison with the Fosdick 12-3/4" bearing* The head
The head bearing on the arm on the
head gib is kept in good adjustment the arm surfaces will begin to wear*
The difference In the weight of two m; chines is ar&und 650 lbs* with
the Carlton being the heavier machine* The price advantage enjoyed by the
Fosdick is around $400*00* If the customer wants to add the cost of the
power elevation to the table the price difference is a little over ^100*00.
We do not believe there will be too much price resistance to our machine
If the customer is advised of this fact*
On the larger model radial drills
there have been some changes made also.
that the Fosdick Company builds,
They have Installed a new clamping
feature on the machine wherein the head and column are clamped simultaneous
ly by engaging the quick return handles* This is hydraulically operated
from their central hydraulic system* This feature is a good talking point
but there is one point that we would like to bring out* About fifteen
years ago this feature was tried out in our plant and we furnished it on
four machines for one of our customers* At the time it was furnished we
were
ment*
found that the operator would have trouble locating the drill
was due to the pressure needed to engage the levers*
thinking about Incorporating this clamping feature as standard equip-
After’a few months trial
it
>roved to be of little value. We
point,
We are reasonably
This
sure that the Fosdick will be no different.
The new tool ejector that is incorporated on the Fosdick is a good
feature* However there is little need for a device such as this when there
are production Jobs on the machine* The reason for this is that on moat
production jobs a auick change chuck Is used and there is no need for a
tool ejector*
The built in electric light in the arm is a feature that all of the
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radial builders have added since it was first featured by the Carlton
Machine Tool Co* a few years ages
The hydraulic system on the Posdiok Is located on the back o? the arm
ne&r the oolumru This one unit is designed to control the rapid traverse oo
the head- the column clamp* the arm clamp^ the arm elevating and the hydraulic
safety nut
system that should happen to break down the entire machine will be out
0 This naans that If there is any part of the control or hydraulic
of productioHo
The Posdick head Is simS.lar to the Bickford and Gilbert machine *
drive to the soindie is at the top of the head and the horsepower has
be transmitted" through the entire length of the spindle
0 The quill extends
out of the machine and the rack teeth are exposed to the dirt and chips
that will be blown against It and then drawn back up into the head*
bearings In the lower end of this quill are not oiled aucomaGically© ihis
means that these bearings will have to be oiled by the operator and If is
is neglected the bearings will be destroyed© There are 36 sP1S^Le sP0eds
in the head and these speeds are controlled by three levers© There is no
direct reading speed chart. As you are well aware the Carlton has 36
so in die sneeds controlled by two levers sM it also has a 0.^eo| rea|^ng
aoeed chart. There are IS power feeds ranging_from .903
"to -
125"„
The
go
The
including
fgge'e"¥apTead6. The Carlton has IS power feeds ranging from .004" uo
1l25" Including f
our tap leads.
The ciulck return mechanism and the feed clutch has been redesigned and
we note a difference which we want to bring to your attention.
The feed
clutch i3 friction device equipped with a multiple disc clutch. Any feed
clutch that has a friction drive can prove to be troublesome, both from a
maintenance and a oroduotlon standpoint,
This type clutch will need
more
attention than a positive tooth clutch.. The rate of penetration can fall
off very much before the drop in production is noticed and of course this
will cost the user money. It is another place where replacement parts will
have to be purchased from time to time.
The column and base design are similar to all of the radial drill
manufacturers.
There is a difference in the design of the column clamp
which is questionable. The column is clamped by a sliding shoe which is
fitted into the column. The claims for this type of clamp are that there
18 no motion when clamping the column since it Is a straight line motion,
and there is a taper gib in this unit that can be adjusted in order to
maintain a good fit between the column and shoe. We cannot make any true
comparison on this type of clamp. There is this much about the design
that would cause a question as to the rigidity of the raaohine. Prom the
photograph in the catalogue it looks as though the clamping area has been
reduced to about 1 of the area that would be clamped if. the split type
column were used. !7e know from the experience that we have had in column
design that the column must be very well clamped to the stump in order to
have a rigid machine and this does not look as though it is-accomplished
with a sliding shoe.
THE CARLTON MACHINE TOOL CO,
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