thnx to Benross Joe C and PhilR pics of the end result up
Turbo Mini Forums

So i was thinking on what benross said about carbid bits. and then someone somewhere here i saw someone make a piston dish bigger with a router and then i also remember someone cutting the seats for under crown jets with a butterfly drill bit and saying he was amazed how soft grade the steel of the engine is... so it made me wonder about my wood bits for the router if it could cut a head. so i got an old head out took the router and a cheap wood bit... guess what. its like cutting to ( frozen) butter. so tommorow i will be making a mould and cutting my 1275 head to turbo use!

Edited by Rammie2000 on 9th Mar, 2017.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

Pics please!
Best of luck

ill take pics of the result tomorrow. grts

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

Hah I suggested the router, glad it's working for you!

http://www.ebay.co.uk/itm/291530243293

Good luck. Hopefully it will be quicker and easier than using your dremel.

Phil.

WWW.TURBO-MINI.COM

was it this, Rammie? http://www.turbominis.co.uk/forums/index.p...id=487238&fr=25 (scroll to bottom).

Go slow Rammie, the quicker you can cut the head, the quicker you can scrap it too! Interested to see the outcome.

Edited by PhilR on 11th Jan, 2017.

Ha yes that was it!

So did a first test. Works a tread but the mold needs some tweeking. Pics up tomorrow morning due to flat battery. Had to try it. Cut 1 chamber in about 5 minutes. ( didn't time it but felt like 5. )

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

the bit to follow the one who was done with a bearing



The bit after 2 chambers stil good



The result. Mold needs some tweeking its stil a bit to small



Upside



Underside. 2 sliders that fit tight around the head.

It was like cutting verry hard wood. Amazed me how soft the metal is. The bit is just a cheap 4 euro bit for woodwork.

I know the mold isn't nice looking but i prefer function over looks.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

Like this ? :)
https://aseriesmodifications.wordpress.com/...o-2d-machining/

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/

Aa yes. Apparently. Only not out of free hand. Would like to have them even in size.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

This has surprised me.... excellent work Rammie.

BHP sells engines, but Torque wins races!

Good work Rammie. That's much better than doing it freehand with a Dremel.

While a carbide bit would be more efficient, it would be interesting to grind a wood bit to a custom profile. Maybe one that cuts a shallower angle on the walls and another that cuts the floor flat, but has a very gradual radius into the walls. I've yet to find carbide bits that do this exactly how I imagine.

i have had a thought like that because this one is very wild when getting to a floor part ( its trying to spin the machine since it is more touching it with the center of the bit..... get what i mean? ) so i asked the local orange tools supplier for a catalog and he asked me what i was looking for ( not wanting to say it was to cut out a head i told him it was for something very specifiek to my needs. apparently if you hand them over a drawing they can make some replacement blades for a bit that takes trough a way blades in the form you want... one downside... its a single cut then instead of these twin cut that im using now... and this twin cut already vibrates allot and makes small weaves ( nothing to bad and easy to get out)

bit busy with school now but ill finish it asap and show some pics of the result so i can get an opinion here.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

me 2 and thnx

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

Use a flat bottomed grinding stone ( a 20000 rpm rated one) that is well behaved for the floor. you can dress the stone to the desired profile if you want that.

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/

This is great; ingenious solution to getting a repeatable pattern cut out of the chambers

Edited by Carl S on 17th Jan, 2017.

Working on a better mold so the result should be better 2. So all 4 can be grindee out without moving the mold. And thnx

Edited by Rammie2000 on 17th Jan, 2017.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

So have made them all even in depth and started on camfering but broken the bit. Forgot to take pics of how i made the mold up but was with allot of mesuring and centring trough the valve guides. Works 10 times better now. Chambres were 1.5 mm+ different in dept so valves need to be lapped in again.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

So did take some pics. Hahaha.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

So placed the mold and fittet it with wood pieces that it sits realy tight on the head. Then used a drill trough the valve guides to centre out and painted the head to have a negative of it on the mold printed the form i wanted on a piece of paper copy it 4 times made the same centers on it gleud it onto the wood rechecked and cut it out with a dremel saw. Some sanding and here we go. The room between cambres on the mold is 4 mm thinner than it will be on the head ( the guide that follows it is 2 mm wider than the bit on the router guide plate) hope it makes sense in my crappie English.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

brilliant!

4 equel shaped chambres making 29 cc each. Black is remains from the paint i used to make the mold.

Now have it skimmed a bit and have the valve seats cut ( that is something i won't be doing myself... haha)

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018