CharlyDE
Aluminum
- Joined
- Jul 11, 2014
- Location
- near Münster, Westphalia, Germany
Hi Deckel-fans,
my english is not perfect, so I hope, you can understand, what's mentioned.
I wanted to know the exact transmisson ratio for speeds and feeds of my Deckel FP2 (1st generation, built in 1958).
Without opening the gearboxes, I examined only the upper gearbox (for the spindle speed).
While the "Spindelbock" is unmounted yet, it is possible to count the teeth of the gears in the gearbox for the speeds by looking trough the small gap around the upper gear (the 202 mm (=7,95") long gear with 38 teeth).
For counting the teeth, some color at the tip of a rod was transferred onto one tooth of each visible gear.
Two non-visible gears were touched with a probe tip while another (visible) gear on the same shaft was watched for one full turn.
My results:
motor speed: 1410 rpm (stamped into the type label)
effective diameter of pulley1 (motor): 94 mm (=3,7")
effective diameter of pulley2 (input of gearbox): 188 mm (=7,4")
In the following data, the first number is the speed [rpm] on the dial scale, the second number is the numerator and the third number is the denominator of the fration.
Horizonatal milling:
40: 468 / 8855
50: 128 / 1925
63: 481 / 5775
80: 1476 / 13915
100: 5248 / 39325
125: 1517 / 9075
160: 696 / 3289
200: 7424 / 27885
250: 2148 / 6435
315: 6669 / 16100
400: 456 / 875
500: 9139 / 14000
630: 21033 / 25300
800: 18696 / 17875
1000: 28823 / 22000
1250: 4959 / 2990
1600: 8816 / 4225
2000: 20387 / 7800
Vertical milling (because additional gears in the vertical milling head):
40: 144 / 2737
50: 512 / 7735
63: 148 / 1785
80: 5904 / 55913
100: 20992 / 158015
125: 6068 / 36465
160: 13920 / 66079
200: 29696 / 112047
250: 2864 / 8619
315: 5643 / 13685
400: 20064 / 38675
500: 7733 / 11900
630: 21033 / 25415
800: 74784 / 71825
1000: 28823 / 22100
1250: 109098 / 66079
1600: 387904 / 186745
2000: 224257 / 86190
To get the mathematical speed, calculate:
Spindle speed = (motor speed) * (diameter of pulley1) / (diameter of pulley2) * (fraction see table above)
Example:
At dial scale value 400 rpm for horizontal milling, the fraction is 456 / 875.
1410 rpm * 94 mm / 188 mm * 456 / 875 = 367,4 rpm as mathematical spindle speed
My conclusion:
Deckel obviously calculated with 1500 rpm (motor speed) for dimensioning the gear ratios. If I'm right, all real spindle speeds should be lower than the values on the dial scale.
Why the fractions of the gear transmission ratios are interesting?
If the number of teeth of the feed gearbox is known, too, then it is possible to calculate the exact taper slope angles, that are possible to produce with a facing-and-boring-head (like Wohlhaupter UPA 3) on the FP2.
But I don't want to open the gearbox for the feeds.
Questions:
1. Who can confirm the number of teeth of the gears for the speeds (shown in the table above)?
2. Who can confirm, that the real spindle speeds are lower than on the dial scale?
3. Does anybody know the number of teeth of the gears for the feeds?
Cheers,
Karl
P. S.: With this forum software, I never got uploading pictures working proper. If the pictures are too small, I would be happy, if a friend will upload them.
my english is not perfect, so I hope, you can understand, what's mentioned.
I wanted to know the exact transmisson ratio for speeds and feeds of my Deckel FP2 (1st generation, built in 1958).
Without opening the gearboxes, I examined only the upper gearbox (for the spindle speed).
While the "Spindelbock" is unmounted yet, it is possible to count the teeth of the gears in the gearbox for the speeds by looking trough the small gap around the upper gear (the 202 mm (=7,95") long gear with 38 teeth).
For counting the teeth, some color at the tip of a rod was transferred onto one tooth of each visible gear.
Two non-visible gears were touched with a probe tip while another (visible) gear on the same shaft was watched for one full turn.
My results:
motor speed: 1410 rpm (stamped into the type label)
effective diameter of pulley1 (motor): 94 mm (=3,7")
effective diameter of pulley2 (input of gearbox): 188 mm (=7,4")
In the following data, the first number is the speed [rpm] on the dial scale, the second number is the numerator and the third number is the denominator of the fration.
Horizonatal milling:
40: 468 / 8855
50: 128 / 1925
63: 481 / 5775
80: 1476 / 13915
100: 5248 / 39325
125: 1517 / 9075
160: 696 / 3289
200: 7424 / 27885
250: 2148 / 6435
315: 6669 / 16100
400: 456 / 875
500: 9139 / 14000
630: 21033 / 25300
800: 18696 / 17875
1000: 28823 / 22000
1250: 4959 / 2990
1600: 8816 / 4225
2000: 20387 / 7800
Vertical milling (because additional gears in the vertical milling head):
40: 144 / 2737
50: 512 / 7735
63: 148 / 1785
80: 5904 / 55913
100: 20992 / 158015
125: 6068 / 36465
160: 13920 / 66079
200: 29696 / 112047
250: 2864 / 8619
315: 5643 / 13685
400: 20064 / 38675
500: 7733 / 11900
630: 21033 / 25415
800: 74784 / 71825
1000: 28823 / 22100
1250: 109098 / 66079
1600: 387904 / 186745
2000: 224257 / 86190
To get the mathematical speed, calculate:
Spindle speed = (motor speed) * (diameter of pulley1) / (diameter of pulley2) * (fraction see table above)
Example:
At dial scale value 400 rpm for horizontal milling, the fraction is 456 / 875.
1410 rpm * 94 mm / 188 mm * 456 / 875 = 367,4 rpm as mathematical spindle speed
My conclusion:
Deckel obviously calculated with 1500 rpm (motor speed) for dimensioning the gear ratios. If I'm right, all real spindle speeds should be lower than the values on the dial scale.
Why the fractions of the gear transmission ratios are interesting?
If the number of teeth of the feed gearbox is known, too, then it is possible to calculate the exact taper slope angles, that are possible to produce with a facing-and-boring-head (like Wohlhaupter UPA 3) on the FP2.
But I don't want to open the gearbox for the feeds.
Questions:
1. Who can confirm the number of teeth of the gears for the speeds (shown in the table above)?
2. Who can confirm, that the real spindle speeds are lower than on the dial scale?
3. Does anybody know the number of teeth of the gears for the feeds?
Cheers,
Karl
P. S.: With this forum software, I never got uploading pictures working proper. If the pictures are too small, I would be happy, if a friend will upload them.