Hi Guys
Im having a go at the NGEZ-1 engine to get back into machining, engine wise I have only made two basic steam engines (one being the Hmem EZE).
No I have started on the venturi as I had the right size stock. Im not averse to scrapping a part and having another go at this stage as it's been a while and I had a lot to learn back then when I had to take a break from machining.
So anyway i have a few questions, I have atatched the diagram for the part ( they are paid for plans but have only included the venturi).
The cone part of it, the diagram shows it as 10 degrees on the outside and 20 degrees on the inside. How can I taper the inside of the cone? My cutter is too big to get in there. Although I can set the slide to 20 degrees, do I need to make small cutter?
So far I have a square centre, the small round section (to size) and the cone to size but not the inside. I have also drilled the hole.
Now for the rest Im guessing I just need to square off the square section on the mill and use the Z axis readout to get the correcnt dimensions. But how would you reccomend doing the cross hole? Workholding wise as I have decent vice with parallels but I can only use one as the part is too thin, and so any attempt to drill will hit the parallel which obviosuly I want to avoid.
Lastly I have a 0.125" reamer but only metric drills, should I use a 3mm or 3.1mm drill before reaming? Will the 3mm leave too much material for the reamer to remove?
Thanks
DJH
Im having a go at the NGEZ-1 engine to get back into machining, engine wise I have only made two basic steam engines (one being the Hmem EZE).
No I have started on the venturi as I had the right size stock. Im not averse to scrapping a part and having another go at this stage as it's been a while and I had a lot to learn back then when I had to take a break from machining.
So anyway i have a few questions, I have atatched the diagram for the part ( they are paid for plans but have only included the venturi).
The cone part of it, the diagram shows it as 10 degrees on the outside and 20 degrees on the inside. How can I taper the inside of the cone? My cutter is too big to get in there. Although I can set the slide to 20 degrees, do I need to make small cutter?
So far I have a square centre, the small round section (to size) and the cone to size but not the inside. I have also drilled the hole.
Now for the rest Im guessing I just need to square off the square section on the mill and use the Z axis readout to get the correcnt dimensions. But how would you reccomend doing the cross hole? Workholding wise as I have decent vice with parallels but I can only use one as the part is too thin, and so any attempt to drill will hit the parallel which obviosuly I want to avoid.
Lastly I have a 0.125" reamer but only metric drills, should I use a 3mm or 3.1mm drill before reaming? Will the 3mm leave too much material for the reamer to remove?
Thanks
DJH