Thread: Wickman OPG Optical Grinder.

Originally Posted by Stustoys

Well thats sounds cheap enough even for me

A man after my own heart.

Originally Posted by Stustoys

No Idea what it is but there does seem to be some there. Once the film is removed it wont stick back on.

Static, spotlessly clean, spit or that fabulous modern tecnologicy stuff. That my lot. I am all out of further ideas.

Originally Posted by Stustoys

Talking about static, anyone got a good way of discharging poly?

Had a sulphur crested type polly screeeeching at unbelievable volumn just outside at about 9:30 pm the other evening. I was tempted to discharge a firearm to explain my displeasure at his behaviour when I was thinking about going to sleep but I guess that is not quite the right method you require.

Originally Posted by Stustoys

Yeap pretty much the same stuff I think.... though there are 9 types of Makrolon!

Sounds like too many to keep track of!

Originally Posted by Stustoys

Sounds like you need a new plastics guy
But then I'm only using poly as a guess, I thought about perspex but google told me that was a cheaper inferior alternative(the big one was it shatters they tell me) to polycarbonate.

Yes I need a new plastics guy, but he is the only one I have. Perspex is old school. Cheaper but not always good enough. It is fun to shape with heat tho. I have an old electric frying pan that I use. Cement sheet under the bits you don't want hot. Cheap (free) and easy.

Dean

Found a way in, its in three parts now. Dinner time!

Stuart

Originally Posted by Stustoys

Found a way in, its in three parts now. Dinner time!

Stuart

I have a 12lbs sledge hammer too

Originally Posted by Ueee

I have a 12lbs sledge hammer too

Close, a claw hammer, some Aluminium and a large rubber mallet. Followed by what some might call feather and wedges.....0.5mm at a time. but I got there.

We've had some tiny halfmoons, now for some big ones and a (what looks like) hand ground oil groove.

After all that turns out my measuring must have been a little on the rough side of rough!(see picture) After all the things arent as bad as I thought, serves me right I guess.

Now do I try and get the pins out, which should make things easier when it comes to putting it back together, but could really make life tough if I damage them trying.

Stuart

Originally Posted by Stustoys

Now do I try and get the pins out, which should make things easier when it comes to putting it back together, but could really make life tough if I damage them trying.

Are you going to want to move those two slide sections closer together to make up for the wear? Wasn't that the gib that had shim under it. If you elongate those SHCS holes, then you can re-ream the dowels. Must dowels are case hardened, if you grind a few millimetres off the end, you should be able to drill them.

And that looks a perfect job for a little drill guide bush. I'm guessing they are 3/8" dowels. If you had a bit of stock and bored one end 3/8" so it located over the dowel, and drill through at tapping drill size for the rest of it.

Regards Phil.

Originally Posted by Machtool

Are you going to want to move those two slide sections closer together to make up for the wear?

I have no idea. Am I? sure sounds like a good idea. Yes the gib had a .3mm shim

Originally Posted by Machtool

And that looks a perfect job for a little drill guide bush. I'm guessing they are 3/8" dowels. If you had a bit of stock and bored one end 3/8" so it located over the dowel, and drill through at tapping drill size for the rest of it.

That was the last plan for getting the pins out if I couldnt get the slides off, except starting with a dia grinder to get through the case.

Ok pins come out.

Hopefully picking up a Nilfisk tonight for the dust extraction system.

Stuart

Originally Posted by Stustoys

I have no idea. Am I? sure sounds like a good idea. Yes the gib had a .3mm shim



That was the last plan for getting the pins out if I couldnt get the slides off, except starting with a dia grinder to get through the case.

Ok pins come out.

Hopefully picking up a Nilfisk tonight for the dust extraction system.

Stuart

How big is the Nilfisk Stu, twin motor?

I have a couple of Nilfisk GM80s, aluminium barreled bodied, single motored. Used one in the shed until the diet of cast iron proved terminal. Pretty gutless and the bags are expensive. I use a noisy powerful 30 litre ShopVac now.

BT

Hi BT,
Its a gwd 300 twin motor I believe(though the seller wasnt sure if its twin motor or two speed) came with 4 heads. Hard to work out exactly what it is.

Pin remover has to wait until the DTI crystal maker clears the lathe.

Stuart

Originally Posted by Stustoys

Hopefully picking up a Nilfisk tonight for the dust extraction system.

I'm not deliberiately miss-guilding you. But I think the other Friday, when I dropped in, I'd spoken to the gentelmen that disposed of that. I think he mentioned dust extraction. It was one of those conversations, where I'd rang him in the morning, before I dropped into your place. And got his wife on his phone while he was driving.

I called him back later, when I got back to the ranch, after leaving your place. I think he mentioned arbors, new belt and extraction.

Phil.

Hi Phil,

Well that would be great news, the vacuum cleaning was the easy part, will save me a lot of work, and then I'll have a Nilfisk for end end of the shed(coz they are a little painful to move about in my shed lol)

Stuart

Well the DTI crystal looks great* but didnt work out so well. It wont hold its shape, in fact it turns itself inside out lol. Either its the wrong Dia, the bevel angle is wrong, it was preformed or all three. But its care of the lathe now so onto the pin removes.


The pins are 5/16 (7.9)
Now I'd like to use an M6 bolt but I'm worried the pin wont be strong enough, but if I use an M5 I'm worried the bolt wont be strong enough.

I'm likely worrying to much, I've designed a puller that uses a M12 bolt so the M5 has no torque on it. I figure if the M5 one breaks I can drill it out and try M6 lol

Stuart

*well maybe not great, its infact in backwards

Well the pins are out.
Strangly drilling was very slow yet it tapped like butter(so much so I was worried I'd got my sizes wrong).
In the end I was glad I made my "needlessly complicated" pin puller as I was leaning pretty firmly on a 18mm spanner to get one of them to move.

Time to clean up at least some of the mess and think about what comes next.

Stuart

Originally Posted by Stustoys

Well the DTI crystal looks great* but didnt work out so well. It wont hold its shape, in fact it turns itself inside out lol. Either its the wrong Dia, the bevel angle is wrong, it was preformed or all three.

What about holding it in the right position then gently heating it (I'm thinking boiling water or similar) to "fix" the correct shape, or more likely "forget" the wrong shape..

There was something I read recently about materials with memory, like that wire, you can straighten out and it stays there until you heat it a little and it goes back to whatever shape it had previously remembered...

Regards
Ray

Hi Ray,
I was hoping that with the right size blank and the right angle I wouldnt have to try heat. I'm worried if I'm not careful with the heating and forming things I'll end up with mirage like lensing issues. Certainly be worth a try when I get some time to try it out. It will cost about $0.02 worth of materail if it doesnt work and at least then I'll know if I'm worrying about nothing or not.

Stuart