Ive been calling reputable machine shops all over my area and none of them can, or know who would, be able to lap the deck of a block and a head. I did talk to a recomended place and they said they would go over the deck very slow to acheive the smooth finish for a mhg. Has anyone else had a machine shop do there deck this way? Should they be able to get it smooth enough for the cometic mhg going over it slowly?
Do you HAVE to lap the deck?
- Thread starter Suprafast0422
- Start date
As long as they keep their cutter in good shape, then sure.
Some folks have gotten it surfaced using a different tool... Surface Grinder? It's been a while since it was brought up, but ask your machine shop if they have anything else that can finish a block to a mirror.
Some folks have gotten it surfaced using a different tool... Surface Grinder? It's been a while since it was brought up, but ask your machine shop if they have anything else that can finish a block to a mirror.
As long as the surface meets the RA spec (a Cometic is 50) for the MHG, it doesn't really matter how it was achieved. A CBN cutter run at a slow speed can easy do it.
Dont know where you are in MD but I went to Kunckel Auto in Belair and they charged me $64 to resurface and clean the head. They also specified on the invoice how much material they took off...
I didn't do the block so I cant help there.
I didn't do the block so I cant help there.
When I got mine resurfaced I had to lap mine the machine shop could not get a better finish if you can feel the machine marks with your finger nail its to rough I verifed this with an RA meter
as Jdub stated earlier a CBN cutter at a slow speed will be good for a MLS gasket. call around and ask if they have a CBN cutter instead of asking about lapping it. and to answer your question about getting the block decked that way.. thats how mine was decked and it turned out nice. :]
I can't believe y'all have to actually ask your machinist to make your deck smooth or ask for certain machines/cutters!!!
I need to start machineing motors cause obviously yall have some extreamly ignorant machinists!
The stuff I keep seeing people post about ra specs and people who's deck was too ruff, or machinist who didn't ask for timeing covers and the belt tensioner....this shit is common sense and should be standard practice...metal headgasket or not...
If I had a Bridgeport milling machine with enough travel I could deck a head with 1/4" 4flute endmill for god sake...just can't believe the incompatance (sp) of some of yalls so called "machinists"!!!
I need to start machineing motors cause obviously yall have some extreamly ignorant machinists!
The stuff I keep seeing people post about ra specs and people who's deck was too ruff, or machinist who didn't ask for timeing covers and the belt tensioner....this shit is common sense and should be standard practice...metal headgasket or not...
If I had a Bridgeport milling machine with enough travel I could deck a head with 1/4" 4flute endmill for god sake...just can't believe the incompatance (sp) of some of yalls so called "machinists"!!!
time = money
Longer it's on the machine, the better the finish, but the less they can do in a day...
Longer it's on the machine, the better the finish, but the less they can do in a day...
Poodles;1165930 said:
not compleatly true....if you go too slow it can actually destroy the finish from rolling chips...there is a proper speed and feed for every tool and every material....aluminum generally is a high rpm tool speed with a medium feed rate or else you get tool rub...if your machinist sacrafice machine quality for production time then they simply fail!!
There is 1 way to machine...and that's the right way....I'm not going to crank up the rpm and feed rate on my machine right now because it will wear my tools out and screw the finish...my machine is at it proper rpm and feed rate for the titanium it's cutting...it takes 1 hour for just 1 of my parts to run...yes I can turn it up and produce parts faster but at the cost of quality.
Ever wonder why machine shops are a bit shady?
For every good machine shop there is probably 10 that fuck people over...
For every good machine shop there is probably 10 that fuck people over...
Cubic Boron Nitride...near diamond in terms of hardness. The cutter is actually made of polycrystalline form of the material and is especially suited to machining steel. Polycrystalline Diamond (PCD) is often used to machine aluminum to the same type finish.
jdub;1166175 said:It's very smooth
Gaboon - What I should have said earlier is a CBN cutter at the correct RPM/feed speed (vs "run at a slow speed") will produce a very fine finish. The RPM/feed speed is determined by what material you are cutting.
oh I'm not argueing at all!! I'm pissed that y'all have to ask for such machining...it should be standard operation!!!! Majority of our inserts we use on steel for finish op's are cbn inserts...it's basic shit and shouldn't have to ask.
Gotten to the point here I'll buy a cutter and do mine in my CNC next time as it's hard finding a good shop that takes pride in their work.