Member postings for Keith Wood 1

Neil

I think you have clarified the situation.

Maybe the armature manufacturer sent the incorrect ones to my supplier.

I will relay this information to them.

Best regards.

Keith Wood

John

Yes, mains supply is 110v.

The armature was supplied by a supplier in the US and I believe all the motors use around 90vDC supplied from the controller.

Maybe you are correct.

Regards.

Keith

After many years of good service, the DC motor on my X2 mini mill started its periodic popping and arcing.

Upon stripping the motor I found the commutator grooved so I skimmed it in the lathe, after finishing the clean up I noticed that there was no meat left for another future skim.

I purchased a brand new armature and installed it in the old casing, installing a new set of carbon brushes.

After re-installation and power on I noticed that the motor ran up to speed well but was not stable speed wise, also there is no torque on start up and minimal torque during running.

I re-installed the old cleaned up armature in order to troubleshoot and there is plenty of torque and the speed is stable.

I checked the new armature with a multimeter, the 180 degree check between segments shows good. The adjacent segment check shows good and the individual segment to laminates shows good.

Anybody any ideas.

I have since purchased a new motor and will keep the old motor with skimmed armature as a spare.

Thanks

Keith Wood

Montreal

Sam

They are standard aerospace assembly devices know as skinpins, clecos, etc.

Aerospace supplies should stock them see skinpins.com

Regards.

Tailstock turret, poor locking feature and atrocious alignment, managed to salvage the die holder.

Thanks for all the suggestions.

I am finishing a partially completed loco so all the existing fasteners are BA, a change to metric is not possible.

As for turning down the large washers, this is possible, unfortunately the large washers are about 3 times thicker than the ones I used to buy.

Many of the screws and bolts are visible so the thinner, smaller washers would be perfect.

My guess is that suppliers are substituting the M3 washers for the older 5BA washers due to availability.

Thanks

Keith Wood

Hi

Does anyone still supply the smaller outside diameter 5BA steel washers ?, all my latest deliveries I have received from the UK suppliers have been washers of a larger diameter, say around 0.25" (6.2mm) .

The 5BA washers I used to buy were smaller in diameter and thinner.

Help please.

Keith Wood

Montreal

From my experience and based upon info on the John Baguley website, the blast nozzle orifice diameter should be one seventh 1/7 of the cylinder diameter, so 0.232" for 1 5/8 cylinders.

For nozzle height, research blast cone angles on the web, many people use a 1 in 3 cone and 1 in 6 cone geometry, the 1 in 3 cone should intersect the petticoat pipe and the 1 in 6 cone should intersect the stack or chimney.

Works for me.

Keith Wood

Montreal Live Steamers

Hi

From what I can see it comes off a standard Asian 920 lathe supplied by many companies.

Regards.

Keith Wood

Montreal

I would go with the alum, I removed three broken 8ba taps from some bronze cylinders, placed the cylinders in a pan of saturated alum solution on the stove and simmered, add a spot of water as the solution evaporates.

Two hours and they were gone.

Alum is cheap and leaves the copper/bronze untouched.

Keith W