Valve seat gauging system
A gauging system for checking a valve seat and a valve guide of an engine part, the system comprising: a gauge support mountable to a stable platform; a gauge which, in use, depends from the gauge support and has a gauge head for seating on the valve seat and insertion into the valve guide; a balancing mechanism to seat the gauge on the valve seat with a predetermined load, the valve seat providing the datum for the gauge; a motor to rotate the gauge head with respect to the valve seat and valve guide.
1. A gauging system for checking a valve seat and a valve guide of an engine part, the system comprising:
a gauge support mountable to a stable platform;
a gauge which, in use, depends from the gauge support and has a gauge head for seating on the valve seat and insertion into the valve guide;
a balancing mechanism to seat the gauge on the valve seat with a predetermined load, the valve seat providing the datum for the gauge;
a motor to rotate the gauge head with respect to the valve seat and valve guide.
2. A system according to claim 1 , wherein the gauge is connected to the gauge support by a universal joint.
3. A system according to claim 1 , wherein the motor is mounted on the gauge support to drive a drive shaft attached to the gauge head.
4. A system according to claim 1 , wherein the balancing mechanism comprises a balancing arm mounted remote from the engine part.
5. A system according to claim 1 , wherein the only part of the gauging system in contact with the engine part comprises the gauge head seated on the valve seat and in the valve guide.
6. A system according to claim 1 , wherein the engine part is mounted on a jig so as to present the or each valve seat and valve guide substantially vertically to the gauge and gauge head depending from the gauge support.
7. A system according to claim 6 , wherein the balancing mechanism is mounted to the jig.
8. A system according to claim 1 , wherein a further gauge head for seating, in use, on a second valve seat and insertion into a second valve guide of the same engine part provides the stable platform whilst the first gauge head is seated on the first valve seat and inserted in the first valve guide, the balancing mechanism being located between the further gauge head and the gauge support.
9. A system according to claim 1 , wherein an article having the form of a gauge head for seating, in use, on a second valve seat and inserting into a second valve guide of the same engine part provides the stable platform whilst the first gauge head is seated on the first valve seat and inserted in the first valve guide, the balancing mechanism being located between the article having the form of a gauge head and the gauge support.
10. A system according to claim 1 , wherein the balancing mechanism is adjustable to set the predetermined load.
11. A system according to claim 1 , wherein the predetermined load is in the order of 2 to 30N.
12. A system according to claim 1 , wherein the predetermined load is in the order of 10N.
13. A system according to claim 1 , wherein the gauge is an air gauge.