discussion scratchbuilt 1/5th scale "MV125 GTLS Agusta in Metal"

[Marudek]

Inspire?! I can’t wait to finish my scratch built loco and start BMW R75 in 1:72. Your model is excellent. That pattern on the headlamp is great. I’m sure anyone who wants to be called modeller will try to keep up to your level. I will and I’m sure my next motorcycle will be at least a bit like yours.

Regards,

Marudek

 

[Guest]

Hi Sean,

though have been thoroughly impressed by your work, I was even more impressed (if possible!) by the pictures of your workshop. I have almost the same equipment - Compact 5, the new unimat and the old one dating back to early 60's plus all the necessary paraphernalia - tools, measuring equipment, raw materials and so on all piled up in such a mesh that reflects my miserable life...

By the way, how did you make the body of the engine (that finned thing in your early pictures)???

Another matter altogether. I am not sure (my bad English has allways been a good alibi for my slow moving gray cells) if you will get paid for the job.

Many a time in the past I had the problem of how much to charge for custom made equipment for the University. I will appreciate your opinion.

George.

 

[Guest]

Thanks for the very positive words once again guys!

Marudek that R75 is going to be very small in 1/72 scale ! how much detail do you intend incorporating into it ?

GeorgePapa I won't go into actual pricing on here but I will say If your "commissioned" or "asked" to build something from scratch by someone else explain to them the time which would be involved ! There are a number of things to be factored into the final pricing of the model .

I always look at what scale will it be , what materials will it be made from , do you have access to the real deal or accurate scale drawings to work from, do you have all the equipment and raw materials required to build the model .

It may only cost several hundred dollars in materials and paint for the one model but remember you have to factor the time required to build the model I could never charge an hourly rate as there are literally hundreds of hours involved , and in this line of work there is no profit to be made I'm driven by passion!!

Quite often your best bet is to reserch the value of the real subject and make your pricing decision from there.

Re how I made the vanes in the motor crankcase , the piece was mounted on my mill table and a very small fine cutting disk was lowered down and horizontaly cut into the workpiece in divisions ( eg I cut all the way along the length of the work piece and the mill was raised and the process was repeated again and again until I reached the top of the work piece!)

 

[Guest]

Ok Now it's on two wheels I've been steadily reworking older parts ,

Next job is to finish adding the details to the handle bar clip ons and finish up on the frame and wheels etc before I make a start on the engine.

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[Guest]

Did you manage to get stock tyres from somewhere or have you made them as well?

 

[Guest]

The tyres were machined from sandwiched acrylic sheet.What I did was sandwich 4 pieces of over diameter cut squares of .4 mm

Acrylic and locate the centre drill a hole and mount it to a mandrel .

Once I did this I mounted it in my lathe chuck and turned the basic shape of the outside Diameter of the tyre.

I then cut the inside Diameter which leaves me with a round ring .

The next step was to reverse the Chuck jaws and remount the disk so as I could start shaping the outer Tyre profile, This is a job which I find easier to do with a course file ( bit like wood turning) Once I have a profile I'm happy with It I then clean the course surface with different grades of course down to finer grades of Abrasive papers.

Now the tyre pattern is mounted to my mill chuck which is mounted to my dividing head, I used a 40 division plate on this particular tyre pattern .

The way it works is the over head mill is fitted with a fine disk cutter, while the cutter rotates at high speed the tyre pattern is rotated verticely and the cutter is wound in to the tyre creating a small cut , the tyre is the rotated on the dividing head and locked onto its next division and the same process is repeated again until I reached the entire 360 degree turn around the whole wheel!!This process is very teadious:hipno:

Many differnt cutting patterns can be created using this process ,

I'm very lucky that on the real bike both front and back tyres are Identical , which makes it much easier as I only made the one "pattern Tyre" and Recast it in rubber.If I were to make more than one model of the same subjet I can cast as many patterns as I desire.

As far as rubber casting is concerned I have a friend who does all my casting work for me It's much easier and a lot less messy !! I have tried it myself but find it takes away from my building time .

Sean

Hi Bunker refer to this posting!

 

[Guest]

The attention to detail on this Model is fantastic...I could swear I am looking at a full size Motorcycle under restoration here.

Keep the Pics coming !!

Regards.......Mark

 

[Marudek]

I know R75 in 1:72 will be tiny! I also know you've seen my recent project of another 1:72 scratch built motorcycle.

Your model inspired me to incorporate as much detail as possible in my newest project. That Zundapp consists of 112 pieces. R75 is going to be at least twice that!

Regards, and can’t wait to see more!

Marudek

 

[Guest]

More photos ! I've been making steady progress the last few days putting around 3 solid full days into the build and managed to attach and remake the instruments in aluminium .

look closely and you'll notice the gauges even have their own Vials fitted ( fiddly work )

I did these by sandwiching a piece of clear .04 polycarb sheet between to brass pieces I machined the exact Diameter and turned them in my lathe.

Still a long way to go on the frame components before I can make a start on the engine! Stay tuned and sorry for the dark photos still no flash!!:emo10:

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[Marudek]

Wow! You didn't make me wait long. Another excellent bunch of detail on your model. You know, the more you show the smaller I feel. Since the beginning of your thread I am wondering what documentation you refer to.

It can't be pictures only:thinking:

:respect1:

Marudek

 

[Guest]

Yeap pictures are the best reference I have and my trusty Didital camera !

What I do is find the real subject be it a car or motorcycle in a museum or private collection and spend a good couple of days measuring it from top to bottom recording the measurments next to roughly prepared sketches .

I also take at least several hundred photos , once I get back to the workshop I draw everything up on my CAD Program adding the measurements I took , very drawn out process and not for the undedicated !!!

 

[Marudek]

Aha! Cad program + measurements + hundreds of pictures is the way to your quality modelling. Just one more question: did the owner let you strip his bike down?

:grinball2:

P.S. I will appreciate if you would share your resin moulding technique. I need to learn it to duplicate my scratch built tiny pieces. What resin do you use, where can I buy it etc.

Regards,

Marudek

 

[Guest]

Guys It's been along time I'm sorry !! and theres still been Zero progress on this build and no more recent photos to show!:emo10:

Sean

 

[Guest]

You can't rush things of this quality!!

 

[Guest]

You can't rush things of this quality!!

Thanks for the kind words Peter I'll get back to it some time !!

Sean

 

[Guest]

Any more progress mate?

Very impressive!!!!

But I'm :hungry: for more!

 

[Guest]

Any more progress mate?Very impressive!!!!

But I'm :hungry: for more!

Sorry I have had to put the build on hold for a period of time but I will re visit it.

Sean