Armature Service

Service

In my armature service, I offer the following services:

armature balancing

armature balancing and cut commutator

armature service complete:

clean armature
polish arm shafts
dye armature blank
cut commutator
armature balancing

shorten armature shafts

grinding armblank outer diameter for perfect roundness or diameter on request

grinding arm shaft to 1,5 mm diameter for smaller pinion

For more information and prices please send me your request by mail to the following address: This email address is being protected from spambots. You need JavaScript enabled to view it.

An excellent driver and a balanced armature are some of the best conditions for best race results and the chances to win.
The best driver can make his skills taking evidence, but with a measured and balanced armature he brings out even the smallest amount of optimization of his material.

In a computerized precise measurement system, the armature is measured on its balance and transmit back the values to a self created software.

Using this software (details on the right) can now be determined exactly where and how much material must be removed so that the balance is at its best.

Now the actual balancing follows. The previously in the measuring station determined and into the software converted parameters are now applied in this step, and performed the required material removal at the correct positions.

After balancing follows the control and a complete remeasurement to check whether the last operation was successful.
Here you can see a very good result, which requires no more rework.

The armature service is performed with this balancing machine [photo left] and other special equipment. These devices are designed, manufactured and constantly developed by myself. The basis for the development of these devices is my experience as a slotracer and the teamwork together with some of the best Slotracers in Europe.

For more information and prices please send me your request by mail to the following address: This email address is being protected from spambots. You need JavaScript enabled to view it.

Basics about balancing

Possible reasons for unbalance

- unsymmetrical rotor
(e.g. clamping screw for wheels and gears)

- unsymmetrical masses due to concentricity errors
(e.g. circular error between arm stack and arm shaft,
unequal epoxy mass in the winding)

What is unbalance?

Static unbalance

- can be measured when the rotor is stationary
(e.g. with static Balancer tool for hubs and gears by
MS-Slotparts)
- rotation produces centrifugal force perpendicular to the axis of rotation
- has to be eliminated by balancing in one plane

M_U = unbalanced mass (in mg)
r = distance of the axis of rotation to the unbalanced mass M_U
F = centrifugal force of the unbalance mass M_U
value of static unbalance U = M_U * r
unit of unbalance U = mgmm

Dynamic unbalance

- can only be measured when the rotor is rotating
- rotation causes a tilting moment
- requires balancing in two planes
- is standard for technical rotors

M_U1, M_U2 = unbalanced masses (in mg)
r = distance of the axis of rotation to the unbalanced mass M_U1 and M_U2
F₁, F₂ = centrifugal forces of the unbalance masses M_U1 and M_U2
value of unbalance U₁ = M_U1* r, U₂ = M_U2* r
unit of unbalance U₁, U₂ = mgmm

What is balancing?

By balancing a rotor, the symmetrical mass distribution is restored.
This is achieved by:

- attaching balancing masses on the opposite side
(e.g. place an adhesive strip into the wheels of slotcars)
- removing mass by drilling (e.g. armature balancing)

Example:
Rotor diameter d = .500" = 12,7 mm
Rotor radius r = d / 2 = 12,7 / 2 = 6,35 mm

before balancing:
unbalance U₁ = 8,06 mgmm, unbalance U₂ = 4,23 mgmm
unbalanced mass M_U1 = U₁ / r = 8,06 mgmm / 6,35 mm = 1,27 mg
unbalanced mass M_U2 = U₂ / r = 4,23 mgmm / 6,35 mm = 0,67 mg
Mass₁ remove by drilling = M_U1= 1,27 mg
Mass₂ remove by drilling = M_U2= 0,67 mg