2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
Sponsored by:

Question about 13b irons, and a CNC machine

Thread Tools
 
Search this Thread
 
Old 11-03-07, 01:20 PM
  #1  
Full Member
Thread Starter
 
RAWRX7's Avatar
 
Join Date: Oct 2007
Location: Phoenix AZ
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
Question about 13b irons, and a CNC machine

Is it possible to make new housings whit a CNC machine or are they molded?

my friend has a sweet CNC machine and i wanted to know if i cad out spec's for the housings if i could possibly make then with a CNC machine?
Old 11-03-07, 02:35 PM
  #2  
Engine, Not Motor

iTrader: (1)
 
Aaron Cake's Avatar
 
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes on 91 Posts
The stock parts are cast. They would be difficult if not impossible to CNC in one piece due to the internal cooling passages. You would need to make the end irons in two pieces, the middle iron in 3.

A few minutes spent looking at one of the stock irons will easily show you why.
Old 11-03-07, 03:20 PM
  #3  
Rotary Enthusiast

 
'84-12A-GSL's Avatar
 
Join Date: May 2007
Location: Canada
Posts: 770
Likes: 0
Received 0 Likes on 0 Posts
They are cast iron, than the surfaces are milled.
Old 11-03-07, 03:34 PM
  #4  
Full Member
Thread Starter
 
RAWRX7's Avatar
 
Join Date: Oct 2007
Location: Phoenix AZ
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
i know the irons would be impossible to CNC but the rotar housings are straight through cuts right.

it was just a thought
Old 11-03-07, 03:56 PM
  #5  
(blank)

iTrader: (1)
 
pfsantos's Avatar
 
Join Date: Nov 2005
Location: YYZ
Posts: 2,285
Received 13 Likes on 12 Posts
Well, your title did refer to irons...so that's what was referred to.

As far as the aluminum rotor housings are concerned, the shape would be easier to make, even the tapered coolant passages, but the main problem would be to produce the chromium (?) plating that seems to be impregnated (almost absorbed or something) into the aluminum on the inside. I think I've seen some posts with guys restoring this plating to a certain thickness and then machining to new specs. and remember reading that it's cheaper and easier to just buy new.

Maybe one of the resident experts can refresh my (our?) memory here.
Old 11-03-07, 04:07 PM
  #6  
Engine, Not Motor

iTrader: (1)
 
Aaron Cake's Avatar
 
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes on 91 Posts
Originally Posted by RAWRX7
i know the irons would be impossible to CNC but the rotar housings are straight through cuts right.
it was just a thought
The rotor housings are cast aluminium, cast around a chromed steel insert which provides the sealing surface.

You could probably CNC one out of a billet block of aluminum if you have about 10 hours on the machine, but that won't help you with the chromed surface. New rotor housings from Mazda are about $375 each.
Old 11-03-07, 04:55 PM
  #7  
Full Member
Thread Starter
 
RAWRX7's Avatar
 
Join Date: Oct 2007
Location: Phoenix AZ
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
just wondering. oh well thanks for all the info. i can always count on this site to help me out.
Old 11-03-07, 09:53 PM
  #8  
Back in the game

iTrader: (-1)
 
TehMonkay's Avatar
 
Join Date: Nov 2005
Location: Louisville KY
Posts: 2,456
Likes: 0
Received 2 Likes on 2 Posts
I always thought it'd be interesting to make your own single rotor engine with the aid of a cnc machine.
Old 11-03-07, 10:25 PM
  #9  
Full Member
Thread Starter
 
RAWRX7's Avatar
 
Join Date: Oct 2007
Location: Phoenix AZ
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
CNC machines are fun to play with. endless possibilities
Old 11-03-07, 10:51 PM
  #10  
tom port.. AKA streetport

iTrader: (6)
 
88rxn/a's Avatar
 
Join Date: Jan 2005
Location: ludlow, pa
Posts: 4,659
Likes: 0
Received 0 Likes on 0 Posts
indeed. im waiting to be trained on them at work.
we just got a 4 million dollar one and have 2 more on the way.
then im up to a machinist III
all the old fellers wont retire thought...
Old 11-04-07, 10:52 AM
  #11  
Engine, Not Motor

iTrader: (1)
 
Aaron Cake's Avatar
 
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes on 91 Posts
Originally Posted by TehMonkay
I always thought it'd be interesting to make your own single rotor engine with the aid of a cnc machine.
You don't need a CNC machine to make a single rotor, just a lathe.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Claudio RX-7
Haltech Forum
5
04-23-19 02:50 PM
turbo-minivan
General Rotary Tech Support
69
02-04-16 12:29 AM
wallyrx7
Rotary Car Performance
2
08-20-15 05:55 PM
Machupicchu
1st Generation Specific (1979-1985)
8
08-17-15 08:27 PM



Quick Reply: Question about 13b irons, and a CNC machine



All times are GMT -5. The time now is 04:14 AM.