Engineer's/machinist's help required

[Brian d marge]

Trying to get my head around tolerances/costs in NZ

For argument sake Ill use a nominal of 19mm bore

What sort of tolerance is common in NZ ie if I called 19.0 h10 would the reply be sure no prob , or would I get that strange look ??

What is the average in NZ , ?? Are machining centres common?? what would I expect for set up cost for NC machines , ( can I send files direct )??

Just trying to get my head round expected costs as I dont want to send a drawing off to tightly toleraced , which will drive the costs up ....


Any thoughts

Stephen

[sAsLEX]

PM CADanimal he will know.

[Brian d marge]

Good Idea will later on tonite

Thanks
Stephen

[Wenier]

If ya wanting something done to close tolerance an aircraft place would probably be ya best bet.

I know the cnc machine will do .0001 of an inch tolerance, maybe more havent had a good enough look to know that thou.

[Brian d marge]

If ya wanting something done to close tolerance an aircraft place would probably be ya best bet.

I know the cnc machine will do .0001 of an inch tolerance, maybe more havent had a good enough look to know that thou.

you can get anything done to a fine tolerance its just the cost of the part goes sky high

I am just looking to quantify was readily available around NZ. Ie does every shop hava a digital lathe or are they only at the bigger shop...

Cnc are cnc machines common in Jobbing firms or rare as hens teeth

I use an ole fella here in Japan , he has a clapped out ,,everything and is good for 1/10 of a mm its about this point the costs go high ..

Also I wouldnt set up a product run ,,,, probably damn near kill him

Stephen

[imdying]

It appears that they're quite common, and getting increasingly more so now that they're getting cheaper. Can't help with tolerances though, but as you say, the more accurate you want something, the longer it takes, which makes it cost more.

[Crisis management]

We have engineering expertise and equipment to match any developed country, obviously you will need to source an engineering company that suits your needs. I am no longer involved in engineering but we used to manufacture performance automaotive components to higher standards than our Japanese parent company quite happily so I can't see you having any difficulty getting anything made.

As others suggested PM Cadanimal as he is involved in the industry currently.

[Juan]

Not sure but looked around a few Eng shops around Mount Manganui and they all would find these thing easy....

Any half decent engineer with a cnc macine should be able to produce the parts you require, the more you want the cheaper they should become.... The first batch will also include the cost of planing and programing, after that the parts become proved so therefore cheaper to make....

Good luck....

[Motu]

Most production engineering shops will have a few CNC lathes of various eras,even some old capstan lathes doing the odd job they are suited for.But there are less production engineering shops around than there used to be,and those that remain will usually be specialising in something.There aren't many solo opperators in a small shop with a state of the art machine,and if there are they have cornered some market that they can cream to make owning a half million dollar or more machine possible.But there are plenty of crusty old buggers with some huge relic of a lathe they pulled out of a ship sunk in WWII who can turn out wrist watch parts on it.

[Sketchy_Racer]

At work i can get to .01 of a mm on the hand lathe,

on the CNC lathe, i can get to .001 of a mm. (on the best out of the 4 CNC lathes, and 3 CNC mills)

But yes, we do specific work, and to do an odd job would cost the earth.

[SixPackBack]

At work i can get to .01 of a mm on the hand lathe,

on the CNC lathe, i can get to .001 of a mm. (on the best out of the 4 CNC lathes, and 3 CNC mills)

But yes, we do specific work, and to do an odd job would cost the earth.


I call bullshit

[Brian d marge]

At work i can get to .01 of a mm on the hand lathe,

on the CNC lathe, i can get to .001 of a mm. (on the best out of the 4 CNC lathes, and 3 CNC mills)

But yes, we do specific work, and to do an odd job would cost the earth.

So from what I hear , H10~H11 ( 1/4 of a mm ) would be a acceptable call out for general work around NZ ( easily done with out costing the earth )

But for finer work , I think it might be better to do the one off myself then pay set up costs on a cnc for a product run

Thanks for the input

Stephen

[Brian d marge]

I call bullshit

What do you call it? Susan strikes me as a nice name !

Stephen

[Sketchy_Racer]

I call bullshit

Why do you call bullshit?

[Sketchy_Racer]

So from what I hear , H10~H11 ( 1/4 of a mm ) would be a acceptable call out for general work around NZ ( easily done with out costing the earth )

But for finer work , I think it might be better to do the one off myself then pay set up costs on a cnc for a product run

Thanks for the input

Stephen

.25mm is really easily achieved on a hand mill or lathe.

Depending on how many you have made, will also depend on how much it will cost.

The most expensive part on CNCs (as in Time intensive) is setup time.

Writing the programme (unless its already been done) and clocking up the work. Once set and running, it is really easy to mass produce.

At work, we normaly do quantities in the 500s- 1000-s

[SixPackBack]

brian d'marge- if you where to take your parts/requests to a reputable toolmaker or production Engineering shop they would do their best to match the part to a tolerance, this minimises cost for you. A direct corelation exists between tolerance and cost. If you wish I can supply a list of reputable Engineers within your area.

At work i can get to .01 of a mm on the hand lathe,
on the CNC lathe, i can get to .001 of a mm. (on the best out of the 4 CNC lathes, and 3 CNC mills)

First the centre lathe. Machining down to 0.01MM is possible but largely luck, as such, repeatability is virtually zero. In the real world +- 0.03MM is achievable and repeatable without excessive time or extra processes.

The CNC Lathe. Machining down to 0.001MM also is largely luck and can only really be achieved within a temperature controlled environment, once removed the component is likely to move with temperature differential. Again in the real world +-0.01MM is achievable

I base my assertions on 30 years as a Toolmaker. I now manage a research and development workshop for a company involved within the Electronics business industry.

[Sketchy_Racer]

Fair enough.

Yeah, well, your a damn sight more qualifyed than me!!

I've only done 6 months of my tool maker aprenticeship

and, i should change my lasp post as me saying "I can get it to .01

I believe with patients, I could get down to .01 on the lathe. I can reproduce over 200 items at .03

I dont do much on the CNC's yet, But the guy at my work says he can get down to .001. I would trust his word.

-Glen

[Brian d marge]

Thanks , Just wanted to get my head around what was achievable in NZ. As I sai the old fella round the corner here is really good , but a 500 bit run would give him a cornary!!

At the moment a lot of my work is one off . for the Cr it was a shock piston , Some Swingarm/crankcase bushes handle bar end wieghts and a flywheel , nothing of super critical tolerace ( though the bushes were a bit close )

Though later this year , I may make a run of a few things as people keep asking.

So I was faced with either buy equipment , or try to reduce the costs as much as poss . ie with simplified design ( lower set up costs ) and use of people equipment /experience.

So I sounds like an example H11 call is quite achieveable , should be enough room in that tolerance to swing a dead cat !

Thanks all for the input

Stephen