A customer of mine is building a MKIII supra with a 2JZ in it. I made this so he can install his new fuel system using the stock tank. Holes are cut for a -10 feed and -6 return bulkhead fittings. I also made a second one in case he changes his mind and decided to sump the tank.

 

damn! thats pretty. you need to do some for the MK4 and SC300 crowds!

 

Aggressive feed, low spindle speed?

 

I was actually thinking about it. This seams like the sort of thing that would come in handy to a fair number of people.

Not really. 1/4" hss endmill @ 5100 rpm, 45ipm, max DOC of 0.08 with 35% step over. I could have done it a lot more efficiently but as it was a one off I wasn't concerned about cycle times and wanted to limit the tool changes so I could go do something else.

 

The look is great!!! Some guys get that polished look with a finishing pass, but this looks fantastic, almost like a carbon weave.

 

Thanks. If I had used different tooling and feedrates it would have looked a lot more like what people are used to seeing. For this project visuals were not a concern as it's going to be between the body of the car and the tank. Flat rate job for a long time customer so I just wanted to set it and forget it

 

doesnt it need more holes for the little gasket deal? i just made a pickup for a mk3 supra with a 2j too but just welded fittings and the pickup to the stock lid.

 

Well assuming he brought me the right fuel pump it has just enough holes I actually counted them 3 times because it seemed odd that there were 7 of them.

 

Thats a pretty aggressive chipload per rev. for a .250 HSS EM. I was just trying to figure out why it had the scraped look to it.

 

Probably could have used 3/4 endmill and had a much better finish and 1/4 the cycle time. It alsmost looks like you surfaced the whole thing lol, seems like a weird pattern even for a 1/4 endmill, looks more like a ball nose.

 

I just double checked the math and your right, 0.0022 ipt (0.0086 ipr) is fairly aggressive. I do so much work with 1/4" end mills that I've gotten into the habit of pushing them pretty hard, so to me that was a medium cut. But yes I'm sure it was deflecting the cutter, especially as I normally use cheap hss cutter because they take more punishment before breaking.

Some of it is the machine, 2" from the spindle nose I will measure 0.0005"-0.001" of run out. Part of this may be the head being slightly out of line but some of it is also the holders and them getting worn. One of these days I'll deal with it, and upgrade to a bt30 spindle. For now she still holds 0.001" which is more then enough for the work I'm doing.

 

Yeah or in the least a 1/2 inch, but as I said I wasn't worried about cycle times. I don't have an ATC so I just coded it to do everything with the smallest cutter needed and walked away. If I was doing a run of these I'd switch to a 1/2 carbide and maybe even do both a roughing and finishing pass.

 

Ballnose would like a bunch of tiny lines running all the way around it, not a lapped effect like it is.

At 45ipm on a .250 cutter, you are running over .008"per rev, and it looks like it was a 2 flute so basically .004" chip load per tooth per rev. That is really aggressive for a HSS em, especially a small .250" one. Sound like carbide feeds.

 

does rosseta stone have this language on cd cause i dont know what the hell you guys are sayin, but the part looks good and im jealous, i want a cnc mill.

 

lol take a manufacturing class

 

How the hell did you sneak that post in there? Maybe somethign is jacked with my computer, but I posted up my post about chiploads and your post mentioning the same thing was not there... weird.

Anyways, if you want a real machine just buy my Matsuura
I'm actually thinking of selling it, we should talk.

 

nice piece of work there

 

Makes more sense with no tool changer, are you running a cnc bridgeport or something?


Dave, looks like surfacing on my phone lol, I've never seen any step over that close together, but I believe him if its a standard endmill. Maybe there was a radius on the cutter and that's why the close stepover?

 

?? I think maybe you are getting some of your terminology mixed up, this part has a decent size step over, he said his woc was 35% cutter di.

Small step over is like .010" and under, that is a surfacing stepover.

It looks more than anything some sort of tool deflection, which is why I guessed aggressive feed. If you put a lot of chip load on those small cutters they flex a lot. The part looks like either someone hand scraped it or tig welded the top, I actually kind of like it.

 

Maybe its just hard to tell how big the part is but usually the parts I make you can see basically the whole cutters diameter with each step over, maybe its just because I rarely use 1/4 endmills for anything but small counterbores and cutting a radius so it looks weird to me. What's the diameter on the part? 3"?


Actually now that I think about it its probably more like 75% of the tools diameter, sorry I don't do any programmming just setup and running the parts. So I guess I would expect it to look like 3/16th stepover?

 

Cool.

 

LOL we must have been writing at the same time.

As I've said I'd be very interested in your machine. I'd actually rather have your machine then a newer Haas TM-1. A second machine is not going to be the sort of thing I can swing over night. I'm pretty sure I'll have to upgrade my current slab to hold a machine that size, but depending on what kind of time frame you are looking to sell it in we might be able to work something out. I'm about 30 mins away from you so sometime when we both have some time to spare I'd love to come by the shop and check out the machine. I've only ever used the machine I have so I'm very curious as to what it's like to operate a larger machine.

THanks

I have a tormach. It's not a knee mill but it's similar in weight and hp to a bridgeport. It's a bench top and not really suited to production work, but when I got it I had never machined anything before so it served it's purpose at the time. As soon as is feasable I plan to move up to something bigger.

The part is 4.75" diameter. With the .25 cutter and 35% step over, WOC was only 0.087" which is why the pattern is so tight, combined with the roughness caused by deflection of the cutter it just ends up creating a pattern much different then you'd normally see. The way I made it really wasn't ideal, but it was a Sunday and even with the small cutter cycle time was roughly 25 minutes. If I was making more I'd use a much larger cutter with a wider cut, followed by a 0.003 finishing pass which would give it a very clean finish.

 

I'm not in a huge hurry to sell, but I am wanting to go with a bigger vertical with a pallet changer, or possibly considering a horizontal. I'm here pretty much all the time so if you want to come check out the machine and talk that's cool.

 

if your looking for a good machine for a good price look into a matsuura ra2 they have pallet shuttles on them. i use 2 of them at work from the early 90's good solid machines but not at fast as the mori nv5000 or the haas vf2 that we have. its a good bang for the buck

 

I'm considering an ra2, ra3, or possibly a mam600, I want to stay with matsuura.
The ra's you run, are they yasnac mx1-3 or the i-80 control?