Yep, This old Tony sent me :-)

@RotarySMP

3 жыл бұрын

Welcome.

@Watchyn_Yarwood

3 жыл бұрын

I as well!

That Coborn scraper is a real bit of kit. Seems to put the Biax to shame.

@RotarySMP

3 ай бұрын

It really is a nice tool Bill. A bit over engineered, so no surprise they didn't make many.

You’re giving me the inspiration to bite the bullet and give my harbor freight 7x12 mini lathe some real machinist love! 🤙

@RotarySMP

3 жыл бұрын

If you havent started, take a good look if you cant fit a slightly bigger machine. One step up in size to a 9x makes for a much stiffer machine.

I'm a long way from a pro - I'm a woodworker who wanted a flat bottom on my handplane. So I scraped it (actually, I mainly filed and sandpapered it, controlled by the blue spots). I think I've done around 6 planes so far. I did learn a couple of things: 1) Try to have a separate area for your "metal removal" and "printing" operations (AKA dirty and clean). It only takes a single scraped chip on your workpiece (or surface plate) to mess you up. The print process is very sensitive. Further, the clean area doesn't need to be rigid, so a normal table (or workmate) is fine. The metal removal is much nicer on a nice rigid workbench. I wipe the workpiece down first in the dirty area (with a fairly nasty rag), then AGAIN in the print/clean area with a better rag. 2) Don't go slow in the early stages. Until you're working the whole area - have at it, HARD These two videos are a wonderful antidote to the (IMHO) overly reverential approach many take to scraping - this guy works on machine tools professionally: kzread.info/dash/bejne/fqaTpcWoeM7PXZM.html kzread.info/dash/bejne/qnyIj9eze7SzZrg.html

@RotarySMP

4 жыл бұрын

Thanks for advice. You have a good eye. You picked up that I tend to switch to finish scraping too early. The main cleanliness problem I encountered is that the bed has a lot of corners to trap swarf. Since you are flipping and rotating it a lot, often a chip would fall out and I needed to reclean, sometimes reblue.

Started on the mini lathe series after seeing the last episode. I am following Keith Rucker so scraping is familiar to me 👍🏻

@RotarySMP

3 жыл бұрын

I appreciate yu wading through the series.

ADE sent me over to check you out I like what I see so far

@RotarySMP

4 жыл бұрын

Thanks for watching.

@andrewdolinskiatcarpathian

4 жыл бұрын

RotarySMP Yep, Ade sent new too. Excellent project.

@1ton4god

4 жыл бұрын

He sent me to I like the first video I watched awesome.

Working my way through your vids man, learning heaps cheers!

@RotarySMP

3 жыл бұрын

Glad you are enjoying them.

thanks for taking the time what a great video. ade recommended. subscribed, cheers

@RotarySMP

4 жыл бұрын

Thanks for watching

Need to recommission a mini lathe soon, looking forward to more, sent over by Ade :)

@RotarySMP

4 жыл бұрын

Look forward to your videos of your lathe.

Great stuff, fancied getting one of these lathes its going to be fascinating to see how good they can be.

@RotarySMP

4 жыл бұрын

I am also curious :) Trying my best.

Hi, just subscribed and look forward to this series. When you scraped the V-way at the end, how did you know it was parallel to the flat way?

@RotarySMP

4 жыл бұрын

Hi, and thanks for joining. I think I covered that in Episode 2 or 3.

Came frome tony

@RotarySMP

3 жыл бұрын

Welcome. Hope you like what you find here.

Awesome series, thanks for sharing! What's the width of the manual scraper that you are using? Is it a Sandvik?

@RotarySMP

3 жыл бұрын

Yes a Sandvik. The bought blade is a 25mm carbide, but for this tiny lathe, I did a fair bit with a home made blade with about 12mm of carbide on the tip.

What is the number of points per inch are you looking for? My only advice is to do each pass at 90 degrees from each other so you up not getting ridges of metal but "peaks" I guess people call it cross hatch pattern

@RotarySMP

3 жыл бұрын

I didn't get to hung up on measuring PPI. On very small surfaces like all these mini lathe ways, you are up around 30-40 PPI by the time you get even coverage.

What is the tool you are doing the scrapping with? Second point, do I correctly detect an accent from over the ditch?

@RotarySMP

3 жыл бұрын

If you mean the Coborn power scraper, I did a video on it here: kzread.info/dash/bejne/aWibrrNmhpWtp9Y.html And yeah, I from nwe zilland.

@dondawson7409

3 жыл бұрын

Yeah I found it afterwards

@RotarySMP

3 жыл бұрын

@@dondawson7409 It is a pretty cool tool. I thought the number on it was a model number, but it turns out it is a S/N. They only made a couple of thousand of them.

@dondawson7409

3 жыл бұрын

@@RotarySMP taken in Europe with virus mate

Very interesting, I’m looking for a lathe myself now, and as I’m on a budget and because I’d like a decent long bed,I’m going to have to buy an old one, I’ve always wondered if one can rejuvenate some worn out ways, I guess the main big boys use a huge mill? Really cool vid cheers

@RotarySMP

4 жыл бұрын

Hi Julian. Scraping is not a poor mans solution. If you have sliding ways, and grind both to a mirror perfect flat surface, they will stick/slip so badly as to be unusable. Even high end machine tools with ground ways have oil pockets scraped in. If you are in the UK, you are a lucky beneficiary of de-industrialistion. I check Ebay.co.uk regulary, and good lathes there go for about 1/2 price verses what they fetch in Germany or Austria.

@JulianMakes

4 жыл бұрын

RotarySMP ahh very cool, yeah I’m on ebay all the time looking, good to know about the ways. I’m keen for a Myford super 7 with a long bed :)

@RotarySMP

4 жыл бұрын

@@JulianMakes You can normally get an industrial lathe for the same or less money than a hobby lathe like the Myford. Harrison, Colchester, Hardinge, or even a DS&G 13x42 like this... www.ebay.co.uk/itm/Dean-Smith-Grace-DSG-13-x-42-Metal-Cutting-Centre-Lathe-with-Accessories/124018561083?hash=item1ce015103b:g:yWQAAOSw8G1d~fZi These were the Rolls Royce of lathes, and used by RR. If you look at the how much space a Super 7 on it's stand needs, the difference to a Colchester Master 2500, Harrison 300 etc is minimal.

@JulianMakes

4 жыл бұрын

RotarySMP ooh I’d actually missed that one cheers, I’m looking at a Colchester too and a similar sized leblond, tbh the larger weight will suit my wants much better, it’s just I don’t have the lifting equipment but I’m asking about many of these shops selling do have forklifts etc.

@RotarySMP

4 жыл бұрын

@@JulianMakes That DS&G is out of a Uni machine shop. You'd have to look at it, but the paint looks original, and it doesn't look abused. Really, once you are moving more than about 600kg, it makes little different if it is one ton or two.

I wonder if a person could use a Oscillating tool to accomplish the same thing

@RotarySMP

4 ай бұрын

There are some videos of people modding saber saws into scrapers. Metal scrapers need a fair bit of mass, and the body shape is helpful against fatique.

What "Connely" book did you refer to?

@RotarySMP

Жыл бұрын

Search for "connelly machine tool reconditioning pdf", there are definitely scans of this book floating around the ether. It is a really thorough tome on the subject.

@MagnusNemo-xc5nx

Жыл бұрын

@@RotarySMP Thanks for the tip. Hope I can find the PDF, as used copies of the book are going for a few hundred USD at the moment. Out of print?

Where in Slovakia did you buy the straight edge?

@RotarySMP

3 жыл бұрын

It was some used machine dealer in Komarno.

@chronokoks

3 жыл бұрын

@@RotarySMP thanks i think i know who that is (Peter Farkas).. he not always sells things for good money actually

@RotarySMP

3 жыл бұрын

@@chronokoks No he doesn't. He wants to sell all the heavy stuff in €/kg, which ends up as a complete rip off. I did get a few nice things there, but never went back.

@chronokoks

3 жыл бұрын

@@RotarySMP There were several people like him over the years around Slovakia - folks who bought out the tool rooms of big state owned companies that went under right after the fall of socialism. Some even stole enough stuff to fill several large store rooms :D But they were selling at a very good price. The ones that are still left selling stuff are bitter old fools.

Greetings from Romania, we are basically neighbours, i really like your channel, you mentioned that you got the straight edge from Slovakia, can you maybe give the website? or is it a walk in place. Thanks.

@RotarySMP

3 жыл бұрын

Hi, It was a walk in place, about an hour east of Bratislava. The guy buys up stuff from industrial bankruptcies and sells them on. I went there with a friend from Bratislava. If you need the contact, I will ask my friend if he still has it.

@RotarySMP

3 жыл бұрын

I just remembered, he was in Komarno.

@notDacian

3 жыл бұрын

@@RotarySMP Thanks for the reply, if you can get the contact it would be great! I will owe you a beer. A new straight edge like yours costs around 200-300 Euro... Quite a investment.

@RotarySMP

3 жыл бұрын

@@notDacian The guy can be contacted through his ads on the SK classified website. stroje.bazos.sk/inzerat/119395894/predam-strojne-a-zamocnicke-zveraky.php He has a pretty weird price structure, selling everying €x/kg. So like stuff can be rediculously cheap, but once you get to heavily stuff, it is way over priced.

@RotarySMP

3 жыл бұрын

do not take those cardboard boxes that the guy offers because if he weights everything including the boxes you'll pay at least 10€ for paper :)

If you want to fix your big lathe to have a some what proper feed have a look at this channel. He fitted up a motor to his leadscrew and it appears to work well.Clough42

@RotarySMP

4 жыл бұрын

Thanks. Yes I am subsribed by Clough42. I made up a Stepper mount to drive the Boley leads screw years ago, but my bodged up PSU, driver and controller for it it a PITA to set up. The Mini-lathe rebuild is sort of a prototype for doing a proper job on a decent lathe.

I don't understand why you would scrap it?

@RotarySMP

3 жыл бұрын

Not scrap...scrape. It is a process to carefully remove metal to bring the ways back flat and in alignment. But you are right, scraping the mini lathewas polishing the turd.

@hotrodhunk7389

3 жыл бұрын

@@RotarySMP so instead of using a grinding stone you can do that? Pretty cool to know. 👍

@RotarySMP

3 жыл бұрын

@@hotrodhunk7389 Scraping has advantages over grinding. The surface ends up with undulations of µm, which retain oil, improve the stick/slip behaviour, and reduce the risk of galling.

2:36 - That's a very competent and professional of a machinist of you for not testing and validating accuracy for your reference "precision" granite... yes just hope for the best that everything is accurate, just hope for the best. A component, serious and professional machinist always, always, always measures and validate accuracies of their reference granite surface plate.

@RotarySMP

3 жыл бұрын

I am not a component, serious or professional machinist. I just play one on you tube. I don't have anything to check that granite plate against.

@MagnusNemo-xc5nx

Жыл бұрын

Haha, what a jerkoff comment