Colchester Triumph 2000 Lathe Gearbox Manual — Feed & Leadscrew Gear Reference PDF (EN)

Rotary selectors A B C R S T W X Y Z Input shaft Leadscrew Feed shaft Joystick selector 4--3 6--5 2--1 8--7 The usual disclaimers apply to this document i.e. there may be errors and it us up to you to verify any provided data before making use of it.

Gear number on level 1 2 6 7 8 9 10 11 12 13 14 Middle level – no prefix 30 20 24 23 27 24 28 26 32 18 45 Top level – prefixed T 19 19 35 35 Bottom level – prefixed B 22 22 36 Colchester Triumph 2000 gearbox bob@chainganger.co.uk th January 2007 Number of teeth on gears Gear number on level 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Top level – prefixed T 19 19 32 23 16 35 35 Middle level – no prefix 30 20 22 16 20 24 23 27 24 28 26 32 18 45 Bottom level – prefixed B 22 22 22 33 22 36

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frame. That shaft rotates 0.5 revs per main spindle rev with the LR selector in the L position or 2 revs per spindle rev in the H position. It can reversed, for left hand threading, The input shaft, A, of the gearbox is driven from an output shaft in the headstock (labelled B in the parts section of the Colchester manual) via gears mounted on the swing The gear arrangements of the metric leadscrew machines differ from those of the imperial model so that the same gearbox can bu used by both.types of leadscrew.

Imperial leadscrew machine Metric leadscrew machine Mode Swing frame gears H/L selector Shaft A:Spindle Swing frame gears H/L selector Shaft A:Spindle The standard gears supplied with the lathe for mounting on the swing frame can be configured either for screwcutting and feeds or DP and Mod H 0.8421:1 H Screwcutting & feeding (24x56)/(56x57) L 0.2105:1 (28x55)/(64x54) L H 0.6617:1 H Mod & DP (24x44)/(56x57) L 0.1654:1 (22x55)/(64x54) L Triumph 2000 gearbox. Rev 1. 5 th January 2007 Position A: T1 meshes with 1 G = 0.6333xA F = 0..9091xG so F = 0.5758xA and E = 0.4605xA Position B:

T2 meshes with 2 G = 0.95xA so F = 0.8636xA and E = 0.6909xA There are 6 indepenendent shafts in the gearbox labelled A to F as shown in the diagram. Slides cluster comprising right element of clutch C2 and gears T4 & T5 on shaft B – See note 1. Page 2 of 2 Exception 2 The cluster comprising Gears 1 & 2 (labelled G) is free to run on shaft D. Slides cluster comprising gears T1 and T2 and left element of clutch C1 on shaft A. With the following exceptions all gears are splined or keywayed to their shafts. Exception 1. Gear T3 and left element of clutch C2 is free to run on shaft B. by the control lever immediately below the LR selector. Position R:

C2 engaged D = 2xA Position T; T5 meshes with 12 D = 0.5xA Position C: Clutch C1 engaged B = A Position S: T4 meshes with 7 D = A C is coupled to the leadscrew using a shear pin 2 and B1 F = 0.9091xG T3 and 4 E = 0.8xF B6 and 14 E = 0.8xG Constant mesh gears . Input to the gearbox E drives the feedshaft Also see Note 1. Selector ABC Selector RST Mode Imperial leadscrew machine Metric leadscrew machine Swing frame gears H/L selector Shaft A:Spindle Swing frame gears H/L selector Shaft A:Spindle Screwcutting & feeding (24x56)/(56x57) H 0.8421:1 (28x55)/(64x54) H 0.8912:1 L 0.2105:1 L 0.2228:1 Mod & DP (24x44)/(56x57) H 0.6617:1 (22x55)/(64x54) H 0.7002:1 L 0.1654:1 L 0.1751:1

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The mechanism moves one of the splined gears B2, B3, B4 or B5 on shaft F. For odd numbered speed positions the relevant gear is slid to the right and for evens to the left. Note 1. I have two manuals for the T2000. For both of them the page titled GEARBOX : GEARS is from serial no. 00001 but there is a difference in the arrangement of gears T4 and T5. In the one described above T4 & T5 are a sliding cluster. In the other manual T4 and T5 engage each other with an additional dog clutch and T5 is fixed to the right on Shaft C and the leadscrew are driven from shaft E by gear pair 13 & T6 when the WXYZ selector is in the X position or gear or gear pair 14 & T7 in the Z position.

Saddle travel (sliding) is 0.025” per rev of the feed shaft for the imperial version and, as far as I am aware, that also applies to metric models. The path through the gearbox is the same for both: the only difference between them is the arrangement of the gears on the swing frame. F:D Ratio relative to position 1 2 8 B4 0.8182 1.125 3 5 B2 0.9091 1.250 4 3 B2 1.0000 1.375 5 7 B3 1.0455 1.4375 6 6 B3 1.0909 1.5 7 11 B5 1.1818 1.625 8 10 B5 1.2727 1.75 1 9 B4 0.7273 1 Triumph 2000 gearbox. Rev 1. 5 th January 2007 shaft B and is in permanent engagement with gear 12. They are functionally identical in terms of gear ratios.

Position Gear on shaft D Gear on shaft F Ratio Shaft D is driven from shaft B (and A) by gear pairs T3 & 4, T4 & 7 or T5 &12 as selected by lever RST. Page 3 of 3 Shaft E (and the feed shaft) is driven by shaft F via the constant mesh gears B6 & 14. Slides cluster comprising right element of clutch C3 and gears T6 & T7 on shaft C. Leadscrew . Pitch is 0.25” for the Imperial version or 6mm for the metric model. Position X: T6 meshes with 13 C = 0.5143xE so C = 0.4114xF Position Z: T7 meshes with 14 C = 1.2587xE so C = 1.2086xF Shaft F is driven from shaft D by one pair of gears selected by the joystick. Selector ABC is always in the C position so shaft B rotates with shaft A.

Cluster G is driven from shaft F but doesn’t perform any drive function. Position W: C3 engaged. C = B Position Y: No engagement (leadscrew is undriven) Cross slide travel (surfacing) is half of saddle travel. 8 speed joystick (Gate selector) Metric screwcuting and Mod Selector WXYZ Feed travels Position Gear on shaft D Gear on shaft F Ratio F:D Ratio relative to position 1 1 9 B4 0.7273 1 2 8 B4 0.8182 1.125 3 5 B2 0.9091 1.250 4 3 B2 1.0000 1.375 5 7 B3 1.0455 1.4375 6 6 B3 1.0909 1.5 7 11 B5 1.1818 1.625 8 10 B5 1.2727 1.75

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Because of the lack of a 127 tooth gear in the train, there is a constant, but trivial, error in metric pitches on imperial leadscrew machine or imperial pitches on metric models. 19TPI & D.P. of 19 are a special case. In this instance selector ABC is in the C position engaging clutch C1 so output shaft C is driven directly by the input shaft: all other Although shaft E (and the feed shaft) is driven by constant mesh pair B6 & 14 it performs no intended function as the gears on it are not engaged with those on shaft C as The first character of the setting is ‘N’ for normal, i.e.

the normal arrangement of gears on the swing frame for screwcutting and ‘M’ applies to the arrangement normally used when cutting DP or Mod but could be useful when an abnormal pitch is required. e.g. the setting MLCTZ5 giving 44.98 TPI is a reasonable approximation to 45 TPI. The following 2 pages list the screwcutting pitches in mm and TPI for all combinations of the selector settings and the standard gears on the swing frame. The path through the gearbox is the same for both: the only difference between them is the arrangement of the gears on the swing frame. Cluster G is driven from shaft A by gear pair T1 & 1 when the ABC selector is in the A position or T2 & 2 when in the B position.

Shaft B, shaft C and the leadscrew are driven from shaft D by gear pairs T3 & 4, T4 & 7 or T5 &12 as selected by lever RST. The third is ‘A’, ’B’ or ‘C’, the fourth is ‘R’, ‘S’ or ‘T’ and the fifth is ‘W’, ‘X’, ‘Y’ or ‘Z’ for the respectively marked controls. Metric pitches on an imperial machine are 0.0027% oversize e.g. an error of 0.004mm on 150mm of screwed length. Triumph 2000 gearbox. Rev 1. 5 th January 2007 Standard TPI pitches (i.e. those on the faceplate) are red and standard metric pitches are magenta. Selector WXYZ is always in the W position so shaft C is directly coupled to shaft B by clutch C3. Page 4 of 4 Imperial pitches are 0.0027% undersize e.g.

an error of 0.00016” on 6” screwed length. Shaft D is driven from shaft F by one pair of gears selected by the joystick. The second character is ‘H’ or ‘L’ is for the position of the H/L selector. Shaft F is driven from cluster G by the constant mesh pair 2 & G1. The final character is for the position of the joystick. selector WXYZ is always in the W position. Imperial screwcuting and D.P. Screwcutting pitch errors elements are idlers. For all other pitches :- Scewcutting tables

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