Fittesr and Turners Advice needed on Lathe

[Pub247]

I need to machine up some pins at work For a tool were building. Now i'm a Boilermaker by trade but do have some machining experience with Lathes mainly self taught and i pretty much make it up as i go


I know how to use plenty of other machining tools better for examples mills, line borers, serdi's, and a few other engines machining tools.

I have included a picture of what i have to make which i drew up in solidworks. The main shaft of pin has a 7 degree taper basically goes from 108mm at the top to 92mm at the bottom before stepping down at the end.
I've machined up all the main parts but i'm unsure of the best way to machine the taper. Now i've been looking at our lathe on the net and notice that there's a taper turning attachment for a bigger model. I'm not sure if ours has one.
So my main Question is what is the best way to go about machining the taper?

Also you can see there is a 10mm radius at the top of the taper do i need to buy the correct cutting tip to machine this in?

Thanks in advance Pub

[nemesis_adrasteia]

im a bit rust at this, you should be able to get the correct taper by turning the top slide to the correct angle and taking a cut using only the top slide, disadvange to this is that you wont have autofeed you will have to have a very steady hand. i could be wrong because its been a while since ive used a lathe

[smurfman]

yer ^ hes right im a fitter and turner apprentice il be 3rd yr in jan
how many do u need to make
the topslide is easy enough to get a good finish if u wind the handle nice and evenly get your handfeed and speeds right
as for your 10mm radius u could grind up a tool for it or use a button tool

[smurfman]

where do u work and how long is the whole pin

[Pub247]

The pin is total length is 206.5mm the "main" shaft part with taper is 154.5mm. Material is machine grade aluminium alloy pretty sure its 2012 . I need to make 4 off these.

I'm guessing the top slide is the adjustable angle one. So i set my angle to 7 degrees and run it along slowly working my inwards?

I can get a good enough finish by hand for what it needs to be so thats not a real issue.

If i make a tool for the radius is bright bar good enough to use? or is there something else i should available materials at work is either that mild or stainless steel.

Smurfman i work in Carrum Downs making moulds for plastic products. These are Pins for Road work Barriers and will form the Female end of the pin to join to a male on the other end of the mould

[smurfman]

kk pub sorry bout the late reply yer the topslide is the angle 1 150mm long taper should be fine for the topslide to reach as for the tool bright bar could be ok ONLY becos it ally maybe idk lol another opition is high speed steel it would be better but if u dont have at at work cos try the bright bar first and the angle u set the degrees on the topslide by using half the included angle
hope that helps i will try answer quicker next time

[Pub247]

Thanks Smurfman rep left

[smurfman]

yer thats alright man no wories any time just remember measure twice cut once HAHAHA

[Joe Peeps]

lathe hey? do you keep it in the living room perhaps?

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