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BGM PRO Item number: 3332768
BGM PRO

Double compass -TANZMEISTER- Tool for measuring the residual wall thickness of the engine block/cylinder

TANZMEISTER double caliper for determining the residual wall thickness on components that are difficult to reach with normal measuring equipment
Works like a pair of pliers: enclose the wall, measure opposite with a caliper gauge
Ideal for porting 2-stroke cylinders: e.g. exhaust port, stud bolt areas, between cooling fins
Greater safety when machining: helps to avoid milling through or breaking through
Practical tool for engine revision, tuning and checking before the next milling step
19,90 €*
available immediately
Shipping weight 0,058 kg
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TANZMEISTER double compass - measure the remaining wall thickness before it gets too thin

The TANZMEISTER double compass is a tool for determining the remaining wall thickness in places that are often difficult to reach with calipers or micrometers. It is used like a pair of pliers: One side encloses the wall, on the other side you can easily take the measurement with a conventional caliper gauge. This allows you to keep an eye on the material thickness when machining cylinders and housings and reduces the risk of accidentally milling through.

Remaining wall thickness Porting Caliper compatible 2-stroke cylinder Narrow points accessible

What you use the double caliper for

Exhaust port: Check the wall thickness before opening the contour further or adjusting the roof shape
Stud bolt channels: check critical zones in the cylinder base area and near the channels
Between cooling fins: measure where a straight measurement with the caliper is hardly possible
In general: wherever you want to remove material and need to know in advance what is still standing

How to measure in practice

Position: Open the double caliper like a pair of pliers and enclose the wall cleanly
Contact: ensure a parallel fit so that the tips do not tilt or slip over an edge
Remove: Measure the dimension on the opposite side with the calliper gauge
Repeat: check at several points, especially at transitions and in the area of bars

Tip: For reproducible values, always place the calliper gauge at the same point and hold the double compass without lateral tension.

Important note on measurement

The double caliper helps you to identify critical wall thicknesses, but is no substitute for thinking: castings are rarely perfectly even, and the thinnest point is not always the one you think it is at first glance.

Safety margin: it is better to set several measuring points and not mill "to the edge"
Clean system: deburr measuring points so that the tips do not stand on a burr
Check: measure again after each major milling step before removing any more material

Conclusion

The TANZMEISTER double compass is a simple but extremely helpful test tool for anyone machining cylinders or housings. It quickly gives you clarity about the remaining material thickness, especially when working on narrow points. This makes milling work easier to plan, reduces risk and helps to avoid expensive damage caused by a break-through.

FAQ

You get a very practical measurement because you enclose the wall directly and take the measurement on the tool. It is important to measure at several points and to ensure that the tips are in clean contact.
The double compass "translates" the difficult-to-access wall thickness into a measurement that you can easily take from the outside. The reading and measuring is then done with a normal caliper gauge.
Measure again after each major milling step, check transitions and bridges separately and always leave a safety margin. A clean "dry run" with markings helps to plan the material removal in a controlled manner.
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