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Thread: Homemade lathe in the making?
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5th Apr 2020, 11:14 PM #31Most Valued Member
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Gazza this is a home made lathe my dad built back in the olden days when they were hard to come by
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5th Apr 2020, 11:15 PM #32Gear expert in training
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Well they're not going to be functional if they're not parallel and I don't think there's a welder on the planet cocky enough to say they can weld two bars 0.01mm parallel to each other.
And, yes, welding is permanent, so if it's a little bit out there's no fine tuning to be had.
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5th Apr 2020, 11:17 PM #33Gear expert in training
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5th Apr 2020, 11:19 PM #34Most Valued Member
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5th Apr 2020, 11:23 PM #35Most Valued Member
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Lets be realistic yes the two slides need to be parellel if they are 0.05mm out over 900mm of bed thats more than acceptable im a human not a precision piece of machinery
So long as the head stock/spindle machines the chuck face plate and tail stock that should all align its self and yes even if the slides are out 0.004mm the job will only be out to the bed not the actual machining center line
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5th Apr 2020, 11:27 PM #36Gear expert in training
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5th Apr 2020, 11:41 PM #37Most Valued Member
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If its anything to easy your mind both of the steel angle iron that will anchor the rails will be drilled back to back than welded down square using a digital angle finder and vernier calipers
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6th Apr 2020, 12:52 AM #38Senior Member
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Digital angle finder, vernier calipers, 30mm rod welded to angle iron to within .05 over 900 mm in both the horizontal and vertical plain. Ok.
Though in another 0.05mm for the cross slide.
That's a possible 0.1mm minimum.
Not bad considering you looking at 0.025mm maximum on the cylinder bore.
Cannot wait.
Tony
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6th Apr 2020, 12:58 AM #39Most Valued Member
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Guys whats with the sarcastic posting? Yeah u may be serious but your not helping in a positive the negativity doesnt go unseen, there are probably other people watching that may have the same idea but dont post it due to some of the responses i am seeing right here
Nothing is perfect in life neither you or your maching skills so why would i be any different to you?
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6th Apr 2020, 01:20 AM #40Most Valued Member
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6th Apr 2020, 01:21 AM #41China
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It will be very interesting to see the the final product and the result you you achieve on the cylinder, I may be corrected but I think you may get a lot of replies in the vane of we told you so, I really hope I am wrong
because I am a big fan of making your own stuff.
Thanks for the video, now I know why the Spanish made a Agami spindle moulder I was unfortunate enough to use was such a piece of c#$p
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6th Apr 2020, 01:40 AM #42Most Valued Member
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Thanks Shed thats quiet a ways back i am used to everything spinning on bearings but i only recently ventured into lathes
China had to search that up it came up as a table router
Cylinder is only 90mm deep less than 10cm which isnt much at all the bed is 900mm/90cm 10 tomes longer than the cylinder so chances are it may very well work we will see
Totally forgot about welding Crmo and cancer i may have to figure out another method
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6th Apr 2020, 01:46 AM #43Senior Member
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Fair call I think I am starting to take my frustrations out on others and for that I apologise.
I truly would like to see how this project turns out if you go ahead.
I watched the video you posted and a couple of others about people building their own lathe and good on them .
The thing that none of them did was to show any measurements of the tolerances they machined to. Not one turn anything between centres over the length to show how true it turned. And no one turned anything like you need to and to the tolerances that you require.
This is the point I and others have being trying to get across. The tolerances needed to work to for this cylinder are tight. A lot tighter than I would expect obtainable on a home built lathe.
Tony
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6th Apr 2020, 01:54 AM #44Most Valued Member
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gazza if you only want to bore cylinders it would probably be easier and you might have more success if you make something like a "van norman boring bar"
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6th Apr 2020, 02:10 AM #45Most Valued Member
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Shed i could probably knock one of those up it looks pretty simple but how would i get the drive motor to turn the plunge shaft as both turn sideways one is stationairy the other one moves down
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