another lathe project

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yobbo89 Australia
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another lathe project

#1

Post by yobbo89 »


so it turns out televue use different sizes on thiere barlow extention tubes and also different threads, i almost ruined my job, lucky i did a light pass with the 0.75mm pitch settings,televue use 0.5mm pitch ..

i've machined this one down to 15mm overall so i have a more managable magnifcation that i can change with adding 2'' tube adapters..

now i'm ready for the planetary winter challenge ! it's going to be cold , staying out there is a feat in it'self over getting a decent image ..


i also droped my televue stock extention tube and now the thread is a bit bent, i'll have to learn how to "chase the thread" to fix it.
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scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Lady Fraktor Slovakia
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Re: another lathe project

#2

Post by Lady Fraktor »


One of these years I am going to have to learn how to do this.
A nice job :)
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, AXJ, AXD
Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Takahashi prism, TAL, Vixen flip mirror
Eyepieces: Antares to Zeiss
The only culture I have is from yogurt
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yobbo89 Australia
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Re: another lathe project

#3

Post by yobbo89 »


Lady Fraktor wrote: Sat May 30, 2020 5:46 pm One of these years I am going to have to learn how to do this.
A nice job :)
i just watched alot of youtube videos :lol:
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Lady Fraktor Slovakia
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Re: another lathe project

#4

Post by Lady Fraktor »


Once I retire I will have time to learn :)
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, AXJ, AXD
Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Takahashi prism, TAL, Vixen flip mirror
Eyepieces: Antares to Zeiss
The only culture I have is from yogurt
My day was going well until... people
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Ozypic
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Re: another lathe project

#5

Post by Ozypic »


Congratulations on getting more use out of your lathe, thats great. I remember its hard to get a nice finish on aluminium with the "new" inserts. Going back some 50 yrs I remember all our tools were hand ground out of high speed steel and they all had quiet a bit of clearence angle on them compared to the blunter inserts today, that seem to tear a bit at lower speeds.. I think we used a bit of kerosene as coolant on aluminium. I notice it has a perspex spit gaurd on it like all our cash registers today.... how covid ..... good luck Phill
Phill. Dreaming of Clear Skys .... :D :D :D
SCOPE : Skywatcher 120X600 ST Achromatic Refractor. 
EP's : 25mm & 10mm Plossl , Celestron 8/24mm Zoom EP,
Filters : Solar filter, Badder Fringe Killer & Moon/Skyglow. 
MOUNT : Skywatcher Star Discovery goto Mount.
CAMERAS : ZWO 120 asi MC. / Sony HX400V 50X Zoom.
Binoculars : Saxon 10x50
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yobbo89 Australia
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Re: another lathe project

#6

Post by yobbo89 »


yeah, especially threading at low speeds , my setup/methode gives me a fluffy/grainy finish on the thread, while store bought adapters have a fairly reasonable machined thread . i also do eveything by hand, facing, and turning down , takes for ever changing the cogs over , usualy anything astronomy related 0.75mm is my most used thread for me.
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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gregl
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Re: another lathe project

#7

Post by gregl »


yobbo89 wrote: Sun May 31, 2020 1:35 am yeah, especially threading at low speeds , my setup/methode gives me a fluffy/grainy finish on the thread, while store bought adapters have a fairly reasonable machined thread . i also do eveything by hand, facing, and turning down , takes for ever changing the cogs over , usualy anything astronomy related 0.75mm is my most used thread for me.

A little late to this thread but you might try a good grade of HSS for threading with WD40 as a lubricant. I presume you're advancing the tool with the compound at 29 degrees and not the cross slide. Part of it also depends on the aluminum alloy. I prefer 6061 and have no problems with that. Some of the unknown stuff from the hardware store is very difficult to get clean cuts on.

Also, as to the bent extension tube: If the tube is thin you might be able to make up an expanding mandrel that you could insert in the tube and then expand to push the bend back into place. This is a tool that camera repair folks use for similar problems. Easy to make.
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oscaletrains
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Re: another lathe project

#8

Post by oscaletrains »


yobbo89 wrote: Sun May 31, 2020 1:35 am yeah, especially threading at low speeds , my setup/methode gives me a fluffy/grainy finish on the thread, while store bought adapters have a fairly reasonable machined thread . i also do eveything by hand, facing, and turning down , takes for ever changing the cogs over , usualy anything astronomy related 0.75mm is my most used thread for me.
You actually got some good advice here. Yes, Aluminum tends to tear more than cut with carbide tooling, especially at low rpm. A high speed steel (HHS) external threading tool is what you need because it will be a lot sharper than carbide and cut cleaner. Also, Kerosene as a lubricant works ok but a product like Tap magic for Aluminum is much better. You could also get a Needle file set and take some of the roughness off with those. You can also buy a .75mm pitch thread restoring file for about $10.
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Re: another lathe project

#9

Post by oscaletrains »


gregl wrote: Wed Jun 10, 2020 3:08 am

Also, as to the bent extension tube: If the tube is thin you might be able to make up an expanding mandrel that you could insert in the tube and then expand to push the bend back into place. This is a tool that camera repair folks use for similar problems. Easy to make.

Image
I could have used one of those on a Macro lens I dropped. Broke the filter and bent the threaded lip down a little. I finessed it back best I could with a curved pliers and was able to screw a new filter on it, but you could tell it wasn't just right and that filter will probably never come off and have usable threads again.
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Re: another lathe project

#10

Post by yobbo89 »


Good tips, cheers!
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

Image
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Re: another lathe project

#11

Post by gregl »


Adding to my post above, I don't know your tools or experience so please forgive me if you already know this, but carbide requires absolute rigidity as well as the proper feeds and speeds. Every time I've had a problem with cutting it involves carbide. Many years ago I had a conversation with an expert who told me to stick with HSS on my manual lathe, and he has been right. Just last week I ignored that and spent $35 on a solid carbide spotting drill which lasted three uses before it self-destructed due to the most negligible flex from my tailstock spindle. HSS has done everything I've ever needed and is easy to keep sharp. Only twice did I have a challenge with it and that was cutting through the skin of some iron castings, and another time cutting some chilled iron, which was as hard as diamonds.

And as I wrote above, go for the 6061 aluminum. For steel, if you can get it, 12L14 cuts like hard butter and is a joy to work with. There are online sources that sell by the inch. Speedy Metals is one. Avoid the hardware store "unknownium." Again, sorry if you already know all this.
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Re: another lathe project

#12

Post by oscaletrains »


gregl wrote: Wed Jun 10, 2020 4:18 pm Adding to my post above, I don't know your tools or experience so please forgive me if you already know this, but carbide requires absolute rigidity as well as the proper feeds and speeds. Every time I've had a problem with cutting it involves carbide. Many years ago I had a conversation with an expert who told me to stick with HSS on my manual lathe, and he has been right. Just last week I ignored that and spent $35 on a solid carbide spotting drill which lasted three uses before it self-destructed due to the most negligible flex from my tailstock spindle. HSS has done everything I've ever needed and is easy to keep sharp. Only twice did I have a challenge with it and that was cutting through the skin of some iron castings, and another time cutting some chilled iron, which was as hard as diamonds.

And as I wrote above, go for the 6061 aluminum. For steel, if you can get it, 12L14 cuts like hard butter and is a joy to work with. There are online sources that sell by the inch. Speedy Metals is one. Avoid the hardware store "unknownium." Again, sorry if you already know all this.
At one of the shops I worked at in the past, we were finishing the loop forgings that go on the rear of various bulldozers and such to pull other things with. Had to machine them and turn threads on them, I'd guess they weighed maybe 50lbs each or so. Anyway, that was my first experience with ceramic tooling inserts. They cut almost anything but if you dropped one on the floor, it was history. Cast iron has that stinking hard as glass outer layer that you have to cut deep enough to get under or it causes all sort of issues. Railroad wheels are the same except deeper, the pounding they take in use on the rails work hardens the outer layers and it is like trying to cut a file. No lite first cuts on those. One time I was cutting cast iron castings on a Warner Swasey 3 and a tiny spec of cast iron hit me in the eye from the side. I went to the hospital and they said that it would work its way out and sent me back to work but my boss said screw that and sent me to a eye specialist. He used a high speed burr to grind the fleck out of the colored part of my eye and said it didn't matter how long I waited I would have had to have it removed eventually anyway. Did you know that you can feel pain in the colored part of your eye and that it causes you to tear profusely while they are messing with it? They clamp your head in a thing so you can't move while they do it too. One of those you never will forget it experiences.
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