Looking to have a small lathe job done ££

[Munkul]

I made this one for my own belt grinder a year or so back,
200mm dia, one piece, trepanned both sides, a keyway and a crowned surface.
Definitely put a crown on it, if the original was crowned then there's a good reason for it.

 

[Noods]

I think that price, if a ‘quote’, might not be enough - being as the specs have changed so much from the original.

Yep I’m not saying it’s been a while but since then West Ham have won the Premier League title 3 times, Rail workers have finally agreed a pay settlement and Mylie Cyrus is now president of the USA..

 

[addjunkie]

No key way needed thanks and right hand thread please.. picture was just an example ..

Draw it, with dimensions, even using pencil, rule and paper. Your far more likley to get the right thing made!

 

[Munkul]

I think that price, if a ‘quote’, might not be enough - being as the specs have changed so much from the original.

That was a valid quote, with allowance made for client change of scope, and some f-around time finding out exactly what the client wants (which was proven exactly right by this thread). A rough drawing with valid dimensions produced, and go-ahead from client before manufacture.

£50 material, 2 hours to machine, and 0.5 hours admin, at £40/hour which is cheap since it's a "fun" job.

I tell ya what, I had a feeling some on here thought that £150 was a rip-off, but I don't bother working for free!

 

[MetalMonkey]

How critical are your dimensions?

You could perhaps get something like this
https://www.castors-online.co.uk/product/100mm-aluminium-high-temp-wheel-4568

Which will give you the rough component, and then just adjust the bore and skim the surface to the desired flatness. It would be undersize though, obviously.
Just a thought, might be worth a bit of googling to see if you can find something that is 90% of the way there.

 

[Agroshield]

I'd be very concerned if a decent lathe couldn't give a flat face.

Lathes would be scraped in and set up to face slightly concave precisely for the reason above - to guarantee a non-wobble.

You can look in the Schlesinger book of words to find out the allowable tolerance (page 49 & 50, fig 15 here: https://www.pearl-hifi.com/06_Lit_A...s/Schlesinger_Georg/Testing_Machine_Tools.pdf).

You do it that way so as it wears, it will wear in (improve or approach flatness) before it wears out (becomes convex). It is the same with a tailstock. You would set it slightly high so that as it wears, it approaches centre height before wearing further until it is too low.

 

[Noods]

How critical are your dimensions?

You could perhaps get something like this
https://www.castors-online.co.uk/product/100mm-aluminium-high-temp-wheel-4568

Which will give you the rough component, and then just adjust the bore and skim the surface to the desired flatness. It would be undersize though, obviously.
Just a thought, might be worth a bit of googling to see if you can find something that is 90% of the way there.

That’s a good spot … thank you

 

[Noods]

I so appreciate all your ideas and views etc.. Thank you all…

 

[minimutly]

Lathes would be scraped in and set up to face slightly concave precisely for the reason above - to guarantee a non-wobble.

You can look in the Schlesinger book of words to find out the allowable tolerance (page 49 & 50, fig 15 here: https://www.pearl-hifi.com/06_Lit_A...s/Schlesinger_Georg/Testing_Machine_Tools.pdf).

You do it that way so as it wears, it will wear in (improve or approach flatness) before it wears out (becomes convex). It is the same with a tailstock. You would set it slightly high so that as it wears, it approaches centre height before wearing further until it is too low.

Rabithole allert!

 

[8ob]

I so appreciate all your ideas and views etc.. Thank you all…

I can pm the Samaritans hotline number if you think it would help.

Bob

 

[Noods]

I can pm the Samaritans hotline number if you think it would help.

Bob

Ha.., i’ve been there and past it unfortunately in a previous life.. I guess that’s why i so appreciate now the friendship enthusiasm and encouragement you get on here..

 

[8ob]

Ha.., i’ve been there and past it unfortunately in a previous life.. I guess that’s why i so appreciate now the friendship enthusiasm and encouragement you get on here..

I have a 4” diameter Ali billet here, if it’s just a matter of parting a bit off and putting an m14 thread through the middle I may be able to help.

Bob

 

[MetalMonkey]

Perhaps it is just me, but I didn't find it particularly hard to visualise what Noods was requesting in his original post.
Not really sure where the relevancy of the flatness of the faces of discs and lathe geometry comes in.
It is a non-cambered sanding belt wheel, and the level of precision need only be commensurate to the application. Pretty self explanatory to my mind...

 

[Noods]

Perhaps it is just me, but I didn't find it particularly hard to visualise what Noods was requesting in his original post.
Not really sure where the relevancy of the flatness of the faces of discs and lathe geometry comes in.
It is a non-cambered sanding belt wheel, and the level of precision need only be commensurate to the application. Pretty self explanatory to my mind...

Ha..,, And Thank you ..

 

[pressbrake1]

Just wanted to be post 60 on a post asking for a bit of turning to be done

 

[ukracer]

That was a valid quote, with allowance made for client change of scope, and some f-around time finding out exactly what the client wants (which was proven exactly right by this thread). A rough drawing with valid dimensions produced, and go-ahead from client before manufacture.

£50 material, 2 hours to machine, and 0.5 hours admin, at £40/hour which is cheap since it's a "fun" job.

I tell ya what, I had a feeling some on here thought that £150 was a rip-off, but I don't bother working for free!

In all honesty initially I thought it was high. More a case of I have the capability, material and machines if the OP got no others offers. HOWEVER as I said in PM after a bit of thought and more understanding of what was wanted/needed the price is actually a good one in a business setting.

Having said that I also feel your understanding that some people on here (my self included) might like to do the job in a hobby capacity as opposed to financial gain.
It's one reason (amongst a lot of others) I am not in business.

The feeling of being creative when for 32 years you have only been in a caring/responsive environment is difficult to explain to others.

 

[ukracer]

Perhaps it is just me, but I didn't find it particularly hard to visualise what Noods was requesting in his original post.
Not really sure where the relevancy of the flatness of the faces of discs and lathe geometry comes in.
It is a non-cambered sanding belt wheel, and the level of precision need only be commensurate to the application. Pretty self explanatory to my mind...

I thought I had visualised it. But Munkuls photo showed an improvement with a longer central spigot that would be a lot better resisting wear.

If I was doing one for myself I would 3D print one to test it.
Then 3D print another and fit a bronze sleeve for longevity once it all worked as envisaged.

 

[pressbrake1]

In all honesty initially I thought it was high. More a case of I have the capability, material and machines if the OP got no others offers. HOWEVER as I said in PM after a bit of thought and more understanding of what was wanted/needed the price is actually a good one in a business setting.

Having said that I also feel your understanding that some people on here (my self included) might like to do the job in a hobby capacity as opposed to financial gain.
It's one reason (amongst a lot of others) I am not in business.

The feeling of being creative when for 32 years you have only been in a caring/responsive environment is difficult to explain to others.

I saw the job as £50
£10 of material and 20mins

 

[ukracer]

I saw the job as £50
£10 of material and 20mins

Lol that would be my initial reaction till I looked in more detail. Although a trained machinist would be way way quicker that I would be doing the job. So pricing by time is not realistic for me.

I do find pricing a very interesting subject though.

 

[addjunkie]

Lol that would be my initial reaction till I looked in more detail. Although a trained machinist would be way way quicker that I would be doing the job. So pricing by time is not realistic for me.

I do find pricing a very interesting subject though.

The most interesting point about pricing is driven by demand……do you need the money from the job, or do you need the job. Very different thing. Id have said a 50 quid job too, but dont need the money or the job. But as a business its not worth getting involved with anything for less than 1/2 a days money. Simplistically put, by the time you invest time to fully understand the end product, cut some stock, machine, tap, clean lathe, then package to have courier collect, its roughly 1/2 a day.