pics wanted for cutting the head

[hannesd]

hello guys,

would anyone have some pics as to see how to setup the head onto a lathe, securely and how fast to spin it? (i gues that last question depends on the specific tool you're using to cut the head,right)

i haven't been able to find some specific pics of a gasser head on a lathe

thanks guys.
Hannes.

not that it makes any difference but it's for my 2001 gasser 200

[Jakobi]

I'm no help mate I'd imagine you'd utilize the thread for the spark plug hole though.

[HenrikSchmidt]

Originally Posted by Jakobi

I'm no help mate I'd imagine you'd utilize the thread for the spark plug hole though.

That's what i normally do, if the plug are centered and axial with the head..
On a gasser top I would do it like that.
Set up a piece of scrap metal (a little bigger than a sparkplug) Cut a sparkplug thread(M14x1.25) on the scrap piece, screw on the head and start cutting away

If you already have a axle with a sparkplug thread, you need to true it in the lathe before cutting, to make sure you're cutting the head even..

Good luck with the project..

[Diggs345]

Id like to see this too , iv been getting some tooling and toolholders for my lathe , now i just need to get some practice in before i attack my head

Henrik , how do you go about reprofiling the combustion bowl after you have reduced the sqish band ?

[HenrikSchmidt]

I would set it up in my CNC Lathe, and draw it up in the cad/cam system first, it'll help me alot on caculating the chamber volume

I do not have any photos, but I found a similar tread on this subject:http://www.gasgasrider.org/forum/sho...ead+mod&page=8

Here, he is using a milling machine instead of a lathe, but he is still holding the head by the thread in a chuck like the one on your lathe.

On a manual lathe it's going to be a little more tricky, since its very hard to make a curved shape on a manual lathe.
I think, I would make up a cutting tool with a fairly big radius, and carefully try to "copy" the original shape of the head by working both axes of the lathe, one at a time, with very small steps.

[Diggs345]

Thanks for the reply , my plan is to get hold of some old two stroke heads to practice on first

[HenrikSchmidt]

good idea..

best if you have the bike to test the effects of the mod.

I'm also playing with 50cc 2stroke moped engines, and it gives you good tuning knowlegde for very little money

[Jakobi]

Originally Posted by HenrikSchmidt

I would set it up in my CNC Lathe, and draw it up in the cad/cam system first, it'll help me alot on caculating the chamber volume

I do not have any photos, but I found a similar tread on this subject:http://www.gasgasrider.org/forum/sho...ead+mod&page=8

Thats my head

[hannesd]

Originally Posted by HenrikSchmidt

That's what i normally do, if the plug are centered and axial with the head..
On a gasser top I would do it like that.
Set up a piece of scrap metal (a little bigger than a sparkplug) Cut a sparkplug thread(M14x1.25) on the scrap piece, screw on the head and start cutting away

If you already have a axle with a sparkplug thread, you need to true it in the lathe before cutting, to make sure you're cutting the head even..

Good luck with the project..

so just by holding the head thrue the spark plug hole would be sufficient?
there will sure be some imbalance because of the piece sticking out of the head, where you atache the head to the frame...

i'll cut an axle with that M14x1.25mm and see how fast i can spin it.

meanwhile, any pics of that setup are still welcome (to give me more self confidence,first time cutting a head)

ciao, Hannes.

[hannesd]

found this :