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I work on oil rigs. There I have experienced a peculiar problem with DC motors. We have many treadmill in our gym. These are used mostly on lower speed for walking. The motors have only motor driven cooling fan. So at slow speed they become quite hot. We had many treadmill breakdown due to...

I recently converted my lathe to 3 phase power by using VFD. To protect the VFD and motor I used a fuse inline with the power input to VFD. I used a 10 A fuse, my motor is 1.5 kW and mains power is 220V. As far as I know start push button on motor control circuit are non latching type. So to...

The gears are for a model traction engine I am trying to built. They are not super critical dimensionally or otherwise. Regards Nikhil

@Jasonb Thanks for the help. I was able to cut the gear. I read in your post somewhere that mod 1 gear depth is 2.4mm. I kept the same. This was my first time cutting a gear. Now I am a little less scared to use a rotary table and indexing plates. I now have to cut more gears, 42T, 30T, 16T...

I have a Seig X2.7 mini mill. I have to cut a Mod 1 gear with 63 teeth in aluminium. I have commercial Mod 1 gear cutter set. I checked the internet for gear dimensions and indexing calculation. Mod 1 gear. 63 teeth OD 65mm Root dia 60.5mm Pitch dia 63mm. My rotary table has 1:72 ratio. I will...

Stupid question. Your two cylinder heads are mirror image of each other with intake port inboard and exhaust ports outboard. Does the cams and plumbing match this setup? Regards Nikhil

This is a container ship. Its normal electrical load demand is high because it carries several thousand refer containers. Generally these ships will have 3 or more generators of 1500-2000kW capacity each at 1000V. Blowers for assisting main engine are big but I don't think they will exceed...

During my college days studying mechanical engineering I made a Stirling engine for some project. Then life took over and I forgot about it. Then I somehow started watching Keith Appleton video on YouTube. This rekindled my interest in model engines. One thing lead to another and I bought a...

Lloyd I don't think couple of tugs could make a difference. If the ship was moving at 7 knots think about the momentum. Another thing is I don't know how long the ship was underway after leaving the port. If it was a long passage at night then fatigue sets in quickly. I remember coming to...

Tug boats are primarily used for berthing/ unberthing operations only. They operate within port limits and are known as harbour tugs. Tugs that operate in open seas for towing or salvage operation are called ocean going tugs. They are of higher power and size. Generally tugs will unberth the...

Other aspect of the story is crew factor. Commercial intrest demand reduction in crew size. Engine room crew will have 3-4 engineers (2 senior and 2 junior) and 1-2 ratings. At the time of incident the engine room will be manned by two engineers(1 senior and 1 junior)and one rating. Or the...

From my experience as a marine engineer I can contribute to "free" knowledge on internet. Ocean going ships generally have a single main engine to turn propellers. It is generally 2 stroke reversible engine running at low rpm. About 150. Aux blowers are required during starting of engine and...

I completed rear wheels for the traction engine. Instead of riveting pads on wheel as per drawing I milled out them using rotary table. I made a mistake in making them and milled both wheels in same setup. So I had to redo one wheel. I made the wheels out of sch 80 4" pipe. It was a long...

I am using them as a cheap DRO on my mill. Works okay.

Trying to build a traction engine. Based on my interpretation of Jules De Waals plan. Just finished front wheels. Regards Nikhil

We still use planimeter all the time. To calculate area under the indicator diagram for measuring power of ships main engines. Now electronic versions of power measurement are common but old planimeter is still found onboard.

Difference between First Angle Projection and Third Angle Projection : SR.NO First Angle Projection Third Angle Projection 1 The object is placed in the first quadrant. The object is placed in the third quadrant. 2 The object is placed between the plane of projection and observer. The...

Third angle projection can be visualized by “unfolding the box,” as if the object itself is being unfolded to show the views from each side. Figure 1 shows the views of a cube being represented by third angle projection. Third angle views are intuitive, as they represent you looking at the...

Hi, I don't know much about machining but making the crankcase by fabrication will be much cheaper and faster than machining it out of solid block of metal. I mean using flat bars and bolting it all together. Not aesthetically pleasing but it may do the job. regards Nikhil

Does the belt slip during normal running or only during heavy cuts? I keep the belt on my mini lathe on slack side. I can take a 1mm DOC in aluminium without the belt slipping. During parting off or grooving operation the belt slips if I feed the tool aggressively. For me a slipping belt is...