Posts

Iris mechanism : Additive manufacturing and more

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Hello people, this is Ruturaj Lonkar (B.E. Mechanical). Recently I was working on a cool project for my bike. I have designed and manufactured an IRIS to cover my bike's keyhole. It is just an aesthetic piece of  engineering to make me feel good while using it. Design : I started with all the basic measurements from my bike related to keyhole diameter, height etc. And further I studied the basic working of iris mechanism and iterated some models in CATIA V5 . With help of assembly workbench of CATIA I was also able to manipulate and actual see the functioning of the mechanism and also check for any CAD related collisions. After few iterations i got the mechanism right. Now it was time to make changes for manufacturability.   Manufacturing:  I had to also consider manufacturability of the product so that I don't face any issue. The design was coming along great but manufacturing it through conventional subtractive method of manufacturing would have cost me alot and also wo...

Bike luggage rack design and development.

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  Hello people, this is Ruturaj Lonkar (B.E. Mechanical). Recently I have designed and manufactured a luggage carrying rack for my bike. Below is a overview of the design and manufacturing process. I did a market survey for the available racks and their load carrying capacity. The cheapest one had load carrying capacity of 10 Kg and costed around Rs.1500. The cost was too high for the product and what's the fun in directly buying. So, I decided to design and manufacture my own rack. Design: So the need for the design was to carry luggage on my bike for long rides, also to carry luggage when shopping solo. The mounting point was a constraint for me, so was the bolt size, due to the tapping present in the chassis. So I made a rough sketch of the packaging and made the corresponding FBD and BMD for the rack. And iterated the max load that the bolts can take. It came out that I can make the rack with max.30 Kg load carrying capacity with current holes and packaging setup. It was hard ...

Second review of yezdi scrambler. (8OOO+ Km experience)

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  Endurance? Hello people, this is Ruturaj Lonkar (B.E. Mechanical). So, I have completed 8000+ km on my Yezdi Scrambler and here is my update on the previous review. Riding in city: I will say it straight up that it is not the most fun bike to ride in bumper to bumper traffic especially when it heats up (which is as soon as you start the bike XD). When in traffic the first gear is too low so in turn the engine over revs, and second gear is to high so the engine under revs and the engine would stall. So you have to continuously manage it with your clutch. The clutch is quite stiff, its like a workout. Crusing in city : When you try to cruise in the range of 20-30 kmph the engine rpm isn't constant. It slightly decreases and increases even though you don't give any throttle input. And this is quite noticeable and discomforting. I have tried to raise this issue at the service station but they are ignorant about it. I think they do not comprehend it. Out on highways/empty streets ...

First review of Yezdi Scrambler (Build quality and in general)

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  Hello people this is Ruturaj Lonkar (currently an undergraduate student in Mechanical Engineering) , its been 4 days since I have got hands on my new bike (Yezdi Scrambler.) So, while inspecting the bike I came across various issues that are related to the build quality of the bike that concerns me. RPM sensor for ABS The clearance between the RPM sensor and the slotted disc is not uniform for a rotation in my bike (which means the sensor disc might not be flat or mounting issues) , so the sensor hits the disc in some part of rotation which makes a sound while riding.You can clearly see the indentation on the sensor disc in the image given below. Bolting of the rear fender The rear fender is mounted on swing arm via bolt (M8 allen head bolt) and it fastened on swing on a jam nut which is spot welded to it. As we ride the bike it under vibrations due to rotary parts and as a result of the vibrations these rear fender bolts get lose as the nuts used do not satisfy the application (...