Very interesting alu. table #68 - Kirov, Russia
 

Greetings to all builders of MM.

Separate many thanks to Gerald for its magnificent idea.

I Dmitriy from Russia. I too have decided to construct the MM.

All has begun in the end of the last year when I have come across this site. I long read, looked, studied... Has then solved - I will build.

My MM is not finished yet, a photo and explanatories I will gradually spread. I think, there is no sense to tell all as I has welded or painted details - with it any more will not surprise builders of MM. I wish to show some my non-standard ways which, I hope, own decisions in MM building will help other builders to make.

April 2009. It is the first step on a way of construction of my MM. I have decided to buy only 8 pieces of V-bearings. On axis Z linear bearings will be established.

July 2009. Test of manufacturing a rail... The result has not pleased.

July 2009. New attempt - it is similar to the truth... Has started to build axis Y.

July 2009. New experiments with manufacturing a rail.

September 2009. Has begun partial assemblage of brains MM. For cooling G203V has made decision to use fans from the computer. Model of fans AMD Socket 754, 939, 940, AM2, F (Igloo 7223 series). A red wire +12V, black wire GRD. The yellow wire has removed.

I plan to do the fourth axis, therefore has left a place for the fifth G203V.
By the way recently I have received it :)

Think there will be no need of the fans, try first without running the fans.

September 2009. Has begun assemblage belt-drive.
Many thanks to Gerald for the help with step-motors. After long searches and reflexions I have decided to go the checked up road, but have a little changed a traditional design of the mechanism of a reducer.
Reducer classical 3:1 (pulleys LS27T5/20-2, LS27T5/60-0, a belt 16T5/355). Has more low loaded drawings in dxf. It is not accurate a little - forgive, I only have started to study AutoCAD.

Dmitiry,

Looks like you have a great start and Welcome to the site.

Though it may seem like you need to have lots of fans to combat the heat, the one fan works find. I agree with Irfan.

Your rails and belt drives look great. Keep taking pictures, we like to see what others are doing.

I plan to combine control-box and the computer in one case. The current of windings of motors 4А - is to that to heat up.

And in general I like all to do thoroughly :)

Great pictures, great thinking, great progress! Thanks!

I love your reduction drive - good thought given to it.

Welcome Dmitriy
Great pictures, love to see more in future

Hi Dmitriy, welcome aboard and as a new builder myself, I’m wishing you all the best and a smooth build with your project. When are you hopping to finish it, you seem well advanced ? Amicalement, Robert ;)

Greetings to all! Thanks for kind words. :) To finish building I plan about New year. Time has not enough - the basic business demands attention.

Dmitriy,

Whether or not you need all of those fans and heat sinks, it looks REALLY sharp. Kind of like a big V8 engine under the hood of a small car. I like it. Good luck with everything.

G' I think seriously we should standardize this design for the reduction mechanism. Its metal laser cut welded and no bends reqd and can order a special shaft and pinion combined. Also we can avoid all nut's by tapping the motor plate by making it 6mm thk, that way we can use screw of upto M6.

ok nuts are reqd to adjust the belt tension a bit :)

Dmitriy's design seems to have all the bearings (or one wide bearing) on the outboard side of the reduction unit.

yes thats what I like too - hmmm is that wrong, ???? I feel it would be ok - I think one more of our forum member has done this already.

Gerald, you are confused with length of a shaft from the bearing to a gear wheel? In my case the shaft is made of stainless steel. For a usual steel there is more reliable configuration, but more bulky.

I am a little bit worried about the flexibility of the shaft. It is quite a long distance from the bearing to the pinion gear. There is no real difference in the flexibility of stainless steel compared to usual steel - the vibration frequency will be the same. It will be interesting to see if you get good cutting results.

Would something like a simple sintered bronze sleeve in the opening by the pinion gear help or hurt?

Gerald, I thought of it. For myself I have chosen a variant with stainless steel - there was at hand suitable preparation. And design more graceful. But the second variant obviously is stronger. And quality of processing we will see when will earn :)

It would remove the concern about flexing. But then that bronze sleeve becomes the most heavily loaded bearing in the system and needs to be upgraded for long life. Which puts you back to having a standard bearing there in the first place.

It seems to me, I have thought up an absolute variant of a reducer. It has a possibility to protect a belt and pulleys from a dust. In drawing I have designated a cover a blue line.

that is a good design - but for motors with different height it might be problem. so need to decide what depth it will be.
may be that can be left as a motor dependent variable.

also since the plate is laser cut on the pinion side a flange and bolt arrangement might not be necessary on the shaft case, we can just have the casing of the shaft match with the hole in the plate and make it go thru.

RGDS
Irfan

Greetings to all builders of MM!
Time on former catastrophically does not suffice.
But there is a small progress.

And here it is new design of mine cut&grind-skateboard. It is similar to the monster, the truth?

And you know, this piece works! And with good results! The rail has identical height on all its length.

This scheme explains a mode of functioning of my design.