It is currently Fri Mar 29, 2024 1:17 pm

All times are UTC + 1 hour




Post new topic Reply to topic  [ 120 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8  Next
Author Message
 Post subject: Re: 1/4 scale T50
PostPosted: Tue Feb 09, 2010 7:54 pm 
Offline

Joined: Sun Feb 19, 2006 3:39 am
Posts: 114
Location: Michigan
Herman wrote:
Looking good!. Is it steel or alu?


Steel Liner, Aluminum piston and cast iron rings is the plan.


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Wed Feb 10, 2010 7:39 pm 
Offline

Joined: Sun Feb 19, 2006 3:39 am
Posts: 114
Location: Michigan
Not much to report right now but i did manage to get the cylinder liners finished and ready to be pressed in. I had been using my milling machine as a makeshift press but now that i have the Bridgeport that's just not going to happen. So now i'm on the hunt for a semi good sized arbor press to do these types of things. Until then I will move on to something else but I don't know what.

??????????????

Image


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Wed Feb 10, 2010 8:11 pm 
Offline
Site Admin
User avatar

Joined: Wed May 12, 2004 4:26 pm
Posts: 2620
Location: Reeuwijk, The Netherlands
Perhaps a local garage that can help out?

Or heat up the assembly untill the liners drop in place. (only works if the metals are different)

_________________
Vive la Marque !!


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Thu Feb 11, 2010 3:53 pm 
Offline
User avatar

Joined: Thu Jan 12, 2006 9:18 am
Posts: 1008
Location: Netherlands, Nieuwegein
Just cool the liners in liquid nitrogen might also work!

_________________
www.BugattiPage.com
www.BugattiRevue.com
www.BugattiAircraft.com


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Fri Feb 12, 2010 2:32 am 
Offline

Joined: Sun Feb 19, 2006 3:39 am
Posts: 114
Location: Michigan
J.J.Horst wrote:
Just cool the liners in liquid nitrogen might also work!



You guy's are missing the point. I get to go by a new tool if i do it my way!!


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Fri Feb 12, 2010 8:58 am 
Offline
Site Admin
User avatar

Joined: Wed May 12, 2004 4:26 pm
Posts: 2620
Location: Reeuwijk, The Netherlands
Then get the tool! We are excited!

Perhaps Harbour Freight?

_________________
Vive la Marque !!


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Fri Feb 12, 2010 11:04 pm 
Offline

Joined: Sun Feb 19, 2006 3:39 am
Posts: 114
Location: Michigan
Herman wrote:
Then get the tool! We are excited!

Perhaps Harbour Freight?


Nope! The quality of the tools at Harbor Freight is so poor that I wouldn't buy one from there at any price. The casting was terrible and the movement was very poor. I purchased one from KBC tool that was very high quality and the movement is smooth as silk.

Tomorrow we move forward!!


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Sat Feb 13, 2010 7:53 am 
Offline
Site Admin
User avatar

Joined: Wed May 12, 2004 4:26 pm
Posts: 2620
Location: Reeuwijk, The Netherlands
Great.

Never been at Harbour freight. However, we have an importer of all kinds of metal working tools (lathes, routers, etc) and the stuff he buys in China actually is not that bad. It usually just needs another day of fiddling and adjusting to get it on par with western world stuff, which usually can be used out of the box.

_________________
Vive la Marque !!


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Sat Feb 13, 2010 9:48 pm 
Offline

Joined: Sun Feb 19, 2006 3:39 am
Posts: 114
Location: Michigan
Got the block finished up. I used a q-tip and painted the surfaces that make contact with the green loc-tite. Green is a very thin liquid that creeps into very narrow gaps. Then using the new arbor press and a small aluminum ram tool that i made, I rammed the liners in. I broke the lower edges of the liner steps with a piece of sand paper so they slid in real nice but it did take a little force.

Image

Image


Over to the mill where i milled the extra .025 off the tops of the liners to bring them down to the deck height.

Image


The bores were finished up in the mill. I like boring in the mill because the sleeves are installed and I dont have to worry about damaging them during the installation. Also the boring head gives me the best chance for a straight bore with minimum taper and the size between all cylinders should be very close because the boring head gets set and all 8 holes are bored. Cant do that on the lathe, well i cant!

Image


With a little debur and a puff of air and she is all ready to be honed. The finish is so nice off the boring bar that very minimum honing will be needed.

Image


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Sun Feb 14, 2010 7:13 am 
Offline
Site Admin
User avatar

Joined: Wed May 12, 2004 4:26 pm
Posts: 2620
Location: Reeuwijk, The Netherlands
Well done, Steve!

_________________
Vive la Marque !!


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Tue Feb 16, 2010 2:36 am 
Offline

Joined: Sun Feb 19, 2006 3:39 am
Posts: 114
Location: Michigan
Started on a set of pistons today. I make the pieces long and turn a diameter on the end so there will be something to hang on to.

Image


The piece is chucked and the OD is turned and the ring grooves are cut. My target was .8495 - .850. I managed to hit the target 8 times in a row. 2 of them were so close i rubbed them with some paper rather than take a chance of cutting under size.

Image

Image


The pieces were flipped upside down and I sat and watched the mill clean out the bottoms.

Image

Image


Tomorrow I hope to get them cross drilled and installed on the rods.

Image


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Tue Feb 16, 2010 9:02 am 
Offline
Site Admin
User avatar

Joined: Wed May 12, 2004 4:26 pm
Posts: 2620
Location: Reeuwijk, The Netherlands
It is always nice to see a machine do all the hard work for you. Again a very nice update!

_________________
Vive la Marque !!


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Wed Feb 17, 2010 1:40 am 
Offline

Joined: Sun Feb 19, 2006 3:39 am
Posts: 114
Location: Michigan
Well today was another awesome day in the garage. We have pistons!!

I hate drilling into anything round because, well, it sucks. I never seem to hit center or my drill seems to drift so i came up with this solution so i could "measure once, cut 8 times". I grabbed the smallest piece of square stock i could find. I turned 2 diameters on it, one being the diameter of the skirt ID - .002 and the same length as its depth. I also turned the smaller diameter .002 smaller than the second step way down in the deepest part of the piston recess.

Image


Then i put it in the mill and milled off enough material so the center was left and was .248 wide. That makes the width .002 less than the slot in the piston.

Image


The piston went on about 3/4 of the way and with a few light taps, it slid right on. I didn't even need to hold it on there but i still used my thumb just in case. Knowing it would work and knowing the large square surface is the bottom of the piston, I found center and that edge and laid out the hole and drilled it .010 larger than the wrist pin.

Image


Then one after another I slid them on and spot drilled, drilled and reamed all eight pistons.

Image

Image


After that step was done I rechucked them in the lathe and parted them off.

Image

I dont have a collet to fit the pistons so i wrapped them in a piece of paper to keep from scuffing them up. If you were wondering what the 3rd ring groove is for. That groove is the top of the piston +.005. I faced the top of the piston until the groove was gone and then took .005 more. The top edge was broken with a piece of 320 grit paper.

Image


All that was left was to debur the wrist pin holes and FINISHED!! Wooohooo!

Image

Image


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Sun Feb 21, 2010 6:42 pm 
Offline

Joined: Sun Feb 19, 2006 3:39 am
Posts: 114
Location: Michigan
After working 29 hours over Friday and Saturday, I was thinking it was time to do something that required very little brain power. I had the gcode finished for some plates that go on the inspection plates. I ended up breaking a 12 dollar bit mostly due to my head being in a fog but it went quite well. I used a .020 end mill and the 2 plates took about 4-1/2 hours to cut. I used the time to clean up around the garage.


The two plates are about 2" wide and 1" tall. Details are cut in .025 deep and the oval is .005 short of cutting thru. I should be able to press the plates right out.

Image


Image


Image


Image


Top
 Profile  
 
 Post subject: Re: 1/4 scale T50
PostPosted: Mon Feb 22, 2010 7:26 am 
Offline
Site Admin
User avatar

Joined: Wed May 12, 2004 4:26 pm
Posts: 2620
Location: Reeuwijk, The Netherlands
Very nice. I completely do not understand the randomness at which a CNC machine performs these actions. I used to have a plotter, and that also drew the drawings completely at random. It is the end result that count, but the thing in between...

_________________
Vive la Marque !!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 120 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8  Next

All times are UTC + 1 hour


Who is online

Users browsing this forum: No registered users and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Valid CSS :: Valid XHTML Copyright © 2007 by Bugattibuilder.com :: Disclaimer :: Contact :: Advertising possibilities

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group