ฝัง
- เผยแพร่เมื่อ 7 ก.ย. 2024
- Welcome back. In this installment, I scrape the head stock casting of the 7x12 mini-lathe to align the spindle along the bed accurately.
This episode is brought to you by Inches, the logical dimensions. Just for Jason of the Home Foundry forum.
![[กูเพิ่งซื้อมึงปิดหนี] 20 นาที ผมรีวิวเกมที่แย่ที่สุดในโลก CONCORD](http://i.ytimg.com/vi/XhC-3q3Ii7I/mqdefault.jpg)
The huge amount of bed flex is the reason my little beast (warco WM180) is bolted down to a seriously chunky bit of I-beam, I added a couple of extra mounting holes in the bed and welded heavy brackets to the I-beam to mount the lathe. after a little time spent shimming and levelling it is very solid! it has made quite a difference to the quality of cut and accuracy of the machine.
After letting the magic smoke out of the old power system, I also upgraded the motor with a 1hp 3-phase unit and VFD, I've got a machine that Is surprisingly capable. It genuinely helps me earn my living while staying compact enough to not require a redesign of my workshop to fit it in! It's still a chinese mini-lathe at the end of the day, but I love it!
You can polish turds to quite a shine if you're determined enough! thanks for the videos!
Thanks for watching. I'll be addressing this in the next video.
Sunday morning, a coffee, lot of cookies and a new video... made my day! Thanks
Your welcome Nico.
Very detail and informative test. This is the vid I was looking for a long time. Thank you
Glad you enjoyed it. I think my editing got a fair bit better in the year since I made that video.
What a pleasure to watch someone as skilled as yourself. I will never get to your level but just watching helps much...thanks.
Kind words, but misplaced. I am not skilled, I just play one on the internet. What you see is the magic of editing :)
Taking fettling to the nth degree, I like it. 👍
Thanks for the encouragement.
Mark! Guess what! I'm finally at this stage with my copy; test bars are in the mail so I can quantify how far off I am. Thank you for the insight into your process, it definitely helps.
Nice one. Only 34 more videos to go :)
Great video. I do need to bolt mine the the bench.
Thanks. I would bolt it down.
After a fair amount on youtube watching manufacturing videos i noticed that most "overseas" TH-camrs have no interest on converting imperial measurements to metric,on the other hand the Europeans try to do that (metric to imperial) to facilitate the overseas viewers.Half a thou,two buckets deep,3 feet long,3 arms wide, 3/16+8/32+4/54 etc.It's a headache.
Greetings from Greece!
NZ only went metric in 1970, so my Dad always used imperial. Plus I became a aircraft mechanic, and planes are still largely imperial. I am pretty comfortable in both systems.
Do you watch Cutting edge engineering? His banana rulers are classic.
Rigidity is everything but if owners only want to turn up some non critical parts for a project then these machines are basically fine. Never seen one that was great straight out of the crate anyway but with some effort they can be ok. I find parting off is a nightmare and must be done patiently lol. Having said that, you'll learn quite a lot about the lathe and machining just by doing improvement projects to the lathe, heck I'm still doing mine :)
I agree. This was my only machine for years, and it is pretty impressive what you can get done, despite the shoddy quality and light construction. Must say that twisting it +/- 0.002" just with the hands surprised me though.
@@RotarySMP me too that's quite a feat of strength...on your part lol. I'd love a big hefty lathe but I just haven't got the room in my shed nor the desire to take on the task of getting such a heavy thing through the door etc
With big lathe/mill, you can cut with about anything.
On those wobbly mini machines, you need super sharp HSS tools with very positive cutting angle to get any precision. Otherwise the machine gets just twisted out of alignment.
One of the benefits of working with these little machines is that when you use a 'proper' lathe (even a relatively small one) you really appreciate the rigidity in a way that ABOM never would!
@@RotarySMP I was very surprised just how weak the bed is as well. Really needs to be bolted down to something flat and rigid, maybe scrape in the surface of a chunky steel I beam?
Thanks a lot for the video, very explanatory.
Thanks for watching.
Put the lathe on a concreet step for more rigidity, cost about 20€ in every baumarkt
That will have little effect if you run the moment of inertia calcs on that bed section.
the intro and outro are son cool
Thanks.
9mm wide V-ways. That tiny stuff would drive me crazy ;-)
I really need to make a smaller hand scraper. At the latest when starting the cross slide ways.
I liked everything. Went to check the price of the book you referenced and is more than 250 Euro. Keep your copy safe!
Wow, I got it as a birthday present a few years ago. I believe you can find a scanned pdf of Connelly online though.
Lol I saw that, said 8" puts up metric rule to show 🤣 good one 👍
Glad you are enjoying the series. Thanks for watching.
Thanks for the video.
Great video series. While I agree with the lack of mass, bolting the bed down (and of course shimming out any added twist) and/or adding angle iron or similar added metal to the length of the bed down near the feet would have to improve the lack of torsional rigidity. Don't you think?
Yes and No. The steel bar I bolted it too reduced deflection significantly. Just not enough. Look that the bed cross section of a Schaublin 70 watch lathe in comparison to see what a stiff bed in a lathe this size looks like.
maybe build a box around the base and fill all of the unnecessary space in the frame with epoxy granite or concrete
I'll get into the reinforcement plan on the next video. Thanks for watching.
I have been looking at a method of checking spindle alignment with the ways that does not require an accurate test bar. It is called Rolle's Dad's Method and I was wondering if you had ever used it. Great video many thanks.
thanks for watching. I used it years ago. Really it is just a test bar with the entire center portion relieved so it is only two rings. Easier to make, and good enough for head stock alignment, but tells you little about wear in the bed.
Thanks for your quick reply. The method you describe is not Rollie;s Dad’s Method (RDM). Your method I believe is widely used to align the tail stock with the spindle axis. The earliest reference I found to RDM is:-
people.ne.mediaone.net/wasser/NEMES/RDMLatheAlignment.html
The method requires a test bar that must be round along its length but does not require to be accurate for, straightness, uniform diameter, it does not need to be mounted accurately in the chuck, nor does the chuck need to be in alignment. No metal removal is involved. DTI measurements are required at the chuck end and the tail stock end along with some simple calculations to establish run out between the spindle axis and the ways although measurements at a few intermediate positions can indicate if the ways are straight. I believe the method provides ready answers for new lathe owners fundamental questions ie are the ways straight and is the headstock aligned to them. Again thanks for your patience.@@RotarySMP
well this evening got even better :)
Glad to assist.
@@RotarySMP i have an older 1.2 meter, clapped out lathe. Most likely made by sieg some 25 odd years ago that im thinking about giving som love. So im glued to these episodes.
@@claeswikberg8958 Get stuck into it. I am sure you can improve it.
What size pulley did you use on the spindle? What was the inner bore diameter? How many teeth? Did you make it or buy it online somewhere?
Do you mean the old set up with the toothed pulley directly onto the spindle? That was an HTD 5 pulley which I got from Mädler.de. I bored it out to fit the spindle.
Any machine tool needs to be bolted down to a solid base that you can't deflect with the cutting forces you're aiming at, that's how I see it at least. Even this bed becomes pretty solid if you bolt it to a 12" thick slab of concrete, it can still be put on top of a cabinet
Thanks for watching. Concrete is not very stable (but probably fine in this application). Epoxy granite would be better, but all that sort of thing really would exceed the scope of this project. I'll address this in the next video.
@@RotarySMP epoxy granite is amazing stuff, but it's not super cheap so you tend to save in the amount. Concrete is fine, but of course only if the amount is high enough. Thanks for the reply.
Btw, are you planning on a cnc conversion or keeping it manual?
@@MF175mp It is. I made some E/G and tested it on the CNCZone endless M/G thread. Got about 40Gpa Youngs modulus. I did make a Head support for a Deckel FP0 from it, but then they project got terminated by buying a MAHO.
What if you fill the voids with epoxy resin?
I didn't bother. Epoxy alone has a very low youngs modulus, so it does very little for stiffness. The whole machine is a bit of a wet noodle, so it would take a lot of redesign to significantly stiffen it up. Better to start with a stiffer machine.
be careful not to take too deep of a cut on these lathes i ended up burning out the motor on mine and couldn't find the same motor to replace it with so i found a 1hp motor for cheap and Jerry rigged it but no i have no speed control
I burnt out the DC motor years ago as well.
Glad to see im not the only one
Fitted a 1 hp 3 ph to mine and now i have to be careful not to snap the bed i half !
@@ianbertenshaw4350 Mine ended up with a 3/4hp 3ph and VFD.
I can imagine that the target audience would expand if you decided against mixing US customary units with metric ones - or spell out the measurements in both units, as many successful youtubers do. I for one became adept at multiplying obsolete units by 2.5 or 25 and lazily letting go of the remaining ~1.5% as kind of an error and I'm no stranger to some mental arithmetic, but, you know, seeing something like .197" makes my skin crawl even though I almost immediately realize that they're talking about 5 mm. Fractions of an inch, e.g. 11/32" are my favorites... I consider myself lucky that the good folks over there on the other side of the pond have never considered using units like the 'jolt' instead of the 'volt' (1 jolt = 15.5 V) and 'dumber' instead of the 'ampere' (1 dumber = 2.3 A). No offense. :)
I doubt the mix of units is holding back views. When you are running a home shop on a budget you invariably end up with a mixture of imperial and metric measuring devices, at least in the Uk, so you have to be somewhat proficient st both. I greatly prefer the metric system though.
I generally work in metric these day, but the Verdict is such a nice DTI, that it made sense to use it for this part of the project. With relative dimensions like this it really doesn't matter. You start with 30 and have to get to 2. Thanks for watching.
why you use imperial? is rare to see a non usa channel using imperial
NZ only went metric in the early 1970's. My Dad always talked in imperial, and gave me some of his measuring equipment, whereas I have bought metric, so I have a mix. I am an aircraft mechanic, and most aircraft, and jet engines are still made with imperial sizes and fasteners, so my apprenticeship was done in imperial.
I mostly work in metric, but probably have a better "feel" for tolerances with imperial, and I really like that Verdict "tenths" indicator.
If you recognize your polishing a turd, Why do it. Never mind Display your turd in the front window
Why not?
What an odd question. If something is inherently flawed but can still be improved by some work, why not do it?
Thanks for watching. A great question, I ask myself every time lay a finger on this project. I talked about my motivation to do this in the first episode. A combination of:
1/ it is there and unused
2/ it would be handy for cutting threads
3/ I want to move from understanding the theory of scraping and machine tool refurbishment to actually doing it, and this is a nice small project for learning
4/ It seemed well suite to make videos for entertaining you.
Think of it this way, it may be a turd but it is going to be one of the best turds around. That's called pride of ownership.😍