Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length.

[Subculture]

The DU (actually should have put DU-B for full accuracy) bushes I mentioned are primarily bronze. The PTFE part is small but improves the friction coefficient. They are designed for submerged use.

Normal sintered phosphor bronze bushes also work perfectly well. Someone on another forum suggested looking in old redundant computer equipment for bushes, which is good advice. I find old CD ROM drives are handy for small gauge ground shafting, bearings, gears, pulleys, motors etc.

[profesorul]

DEREK ,
 
"......Why not contact Norbert & ask...." I wheel do that ,
 
 
@subculture
 
"I find old CD ROM drives are handy for small gauge ground shafting, bearings, gears, pulleys, motors etc."
I know about those bushes,there are very good ,but for these project are TOO SMALL . But even these are hard to find . Not many old computers during these days .
 
THANK YOU BOTH any way .   
 
MARIUS

[Davy1]

H Marius,

I think every material we've mentioned will do the job very adequately but personally I will carry on using pure PTFE. (It is just so easy and cheap to buy a rod of PTFE on ebay.)

(Just for information, water absorption by PTFE is actually pretty minimal compared with Nylon
http://www2.dupont.com/Teflon_Industrial/en_US/tech_info/techinfo_compare.html)

David

[profesorul]

HI,

I made some Hand Sketches with flooding holes for Bow and Aft . I didn't have measurements so I made them at the common sense !. What d You thing Guys ?. They Look realistic enough to be transfered to my model ?.









What are Your suggestion for a successful transfer from paper to model , regarding the model is 3D object and paper is 2d ?

MARIUS

[Subculture]

Looks alright to me. Got some filing to do, haven't you!

Regarding transfer, I would just draw them straight onto the model. Will take time, but there you go- that's modelmaking. Another method if you have a laser printer or photocopy the prints is to use toner transfer. Print the outlines onto glossy photo paper, spin them over and use an iron on a hot setting to melt the toner onto the hull.

Difficult to get the position right however, so i would say drawing them on is the best method.

[profesorul]

HI @subculture .
 
Thanks for the answer .
 ".... Got some filing to do, haven't you!" - You are Absolutely right . 
 
".....Regarding transfer, I would just draw them straight onto the model ......" I wheel choose these method because I don't have another option, but I'm not in a hurry . Is a Splendid method to do something with the spare time       .

 
All The Best MARIUS

[U-33]

Hello Marius!!




Richard

[profesorul]

HELLO RICHARD ,    ?!?!?! .
Is THAT RCHARD I know ?!. 
 
MARIUS

[U-33]

It most  certainly is! How are you?


Richard

[profesorul]

HELL again ,
 
Well sense my last post no one give as another point of view I decided to move on .
And these what came up after :
 

 

 

 

 

 

 

 

 
now is the time , if some one has some advices about how to procede from here .
 
MARIUS

[profesorul]

And complete Nr of Holes:







on the corners each holes I wheel tray to make them round instead 90 degrees .   
 
MARIUS

[Netleyned]

To make round corners now you will
end up with larger holes.
The corners should have been drilled first.
Probably best to clean up the holes and leave
them square.


Ned

[profesorul]

HI @Ned ,
 
"To make round corners now you will
end up with larger holes.
The corners should have been drilled first.
Probably best to clean up the holes and leave
them square."".......How did You know is not going to be easy to make them ROUND ?!?!?! 
Yes I did trayed and at the end I had to leave them square .
 
these is the first Hole :
 

 

 
any Recommendation for ?. 
 
MARIUS

[profesorul]

https://www.youtube.com/watch?v=dTRAcM5-wUc&feature=youtu.be   

[profesorul]

HI ,

I succeed to finish the bow flooding holes .
Before I remove the blue tape I ask You to take a look and tell me if is OK . There are some other detail witch can be made on ?.

 






 
MARIUS

[Subculture]

The hull should flood down easily with that little lot on it, which is the main thing.

I don't know enough about this class to comment on accuracy, but I wouldn't worry about it. Crack on with the rest of the slots, and then you can tackle more interesting aspects of the build.

[profesorul]

 OK , I wheel . 
 
I'm working on the aft flooding holes drawings .
 
MARIUS

[profesorul]

HI There ,   

Not much progress . I Finished drawings for the Aft flooding Holes :











Next stage is transferring them on blue tape and then on Model .
What do You guise twink ? .

MARIUS

[profesorul]

HI all ,

A Little Progress to day
I made the big holes and I'd like to know how to do the rest of it .





               anyone have an idea how they look like those in order to make the scribing ?.

MARIUS

[profesorul]

Hello all ,   
 
After couple months of absence I began working again on LA project . I start working on wtc components and in order to finalize the propeller shaft I need some help and guidance to do these :
- how to find the center of the AFT cone ?;
- how to fix the Bronze Bushing on that cone with the possibility of extraction if is needed ?.
- how do I know what is the correct position before make the hole for bushing ?;
To understand much better what I mean see the pictures:
 

 

 

 
and here :
 

 

 
Maybe I didn't express my self correctly but I think You know what I mean , I hope 
 
MARIUS
 
 

[Davy1]

Hi Marius,

The way I would do it would be to treat the ends of the cones as  2 circles. With dividers scribe a "guess" position using various points around the circumference. A central location will appear. (You can modify the guess as you go along to some extent.)

The bearing could be an interference fit in the cone. (The friction should be low so no tendency to rotate the bearing and the prop will hold the assembly together.) (Presumably there is no shaft seal at the cone end?)

David

[profesorul]

Hi ,
THANK YOU DAVID ,
 
I will try to follow Your advice .
I have a small Ball Bearing for the shaft but is difficult to fix them parallel perfectly with the cone circles (big one and small one)  and I thought is much easier to use that small Bushing and to find a way to fix them on the cone material .

What do You think ?. I wheel make a small hand drawing and post it here .
 
MARIUS

[Subculture]

Not sure how many hours you plan on sailing your sub, Marius. However it's unlikely you'll wear out that bush within your lifetime, providing you give it a drop of oil before each run, so just open up the hole with drills and files, and bond it in. Job done.

[Davy1]

Hi Marius,

Just thinking about this again - you have a lathe don't you?

If so just centre it in the chuck and you are almost there.

And yes, as Andy says, you could bond it in, if you want.

David

[profesorul]

THANK YOU both of You .
Yes I have a small mini lathe and I think is the best way to do it .
I think I have an idea how to do it .
 

Not sure how many hours you plan on sailing your sub, Marius. However it's unlikely you'll wear out that bush within your lifetime, providing you give it a drop of oil before each run, so just open up the hole with drills and files, and bond it in. Job done.

You are right and I will use my lathe for it . 
 
MARIUS