Dean Smith & Grace Saddle Cross Slide re-scrape
2020 ж. 14 Мау.
14 290 Рет қаралды
A rather battered saddle and cross slide was brought in for a rescrape - re-establishing the geometry of the dovetails and making the cross slide a pleasure rather than fight to use. All hand scraping with basic tools.
Love the content and cheeky appearance of the car 👍🏻
Glad you like. There's plenty to go through.
You do amazing work in that little shed come workshop absolutely brilliant 👍👍👍👍
Very kind of you Steve. All the best Mat
Nice to see I’m not the only one who shortens their stones via rapid altitude changes. Looking good Mat 👍
Yeh, very effective, helps if you incorporate directional changes on the way down 😃
Thank you for documenting, very informative
Glad it was helpful!
Mat Thanks very much for doing this - it was way beyond my skill set and It has turned something that was pretty much unusable into useful working machine - Unfortunately it is not back together yet as I've decided to go through the rest of it and paint it - Needless to say I'ma happy camper!
Hi Adam, well a good coat of paint always helps things ! Good luck with the rebuild. All the best Mat
Great job Mat . Cheers .
Thanks 👍
Hi Mat, Realy nice job, well done as allways, be safe.
Thanks, you too!
Nice job！
Thank you
Beautiful work Mat. Great stuff. I wish I knew more about this process, my lathe needs a go. Postage to you from Tasmania to UK would cost more than the lathe cost :-)
Ive been chatting to my mates down under and its looking like a world tour is in order. So, based on the current Patreon support I should be able to see you in Tas around 2090 assuming the flights dont go up meanwhile :-) All the best Craig. Mat
@@lookcreations Sounds awesome Mat. See you then :) Hopefully we've reopened our borders (Covid) by then!
Cat was supervising the shaper. Lol
I didnt see her sneek in - she barely gets out these days - prefers to sit on the next doors shed roof and spy on the dog. Every now and then she stops by to remind me dinner time is only a short time away .. :-)
Nice job Mat. The freshly scraped surface looks so good compared to the worn out parts. I have the same problem on my Broadbent Schofield lathe. The cross slide and saddle dovetails are very worn out and every attempt to adjust the gib is an exercise in compromise between being locked up at the ends of travel and too loose in the middle. It is so far gone I think it would have to be machined before being scraped (the dovetails on the saddle are 38" long, requiring a lot of scraping even if they were close to good). Was it normal practice to make the dovetails parallel to the ends of the saddle when the lathes were manufactured? On my Chin Hung lathe every male dovetail is hardened and ground (cross slide and compound rest) and the female dovetails are soft and scraped to fit the male. In their sales brochure they show the saddle cross slide dovetail being ground. There is a fixture mounted on the grinder that looks like a short piece of lathe bed and the saddle sits on this while the cross slide is ground. I guess this ensures proper alignment between the bed ways and the cross slide dovetail. Using this set up the bed ways and the cross slide dovetail wouldn't necessarily have to be aligned with end of the saddle wings. Maybe the technique is different when you're grinding versus when you're scraping? Thanks, Ken
Hi Ken, I would think that each manufacturer had there own jigs for setting up parts for final grinding to ensure alignment - as you can guess its more long winded measuring and adjusting. Broadbent Schofield made some quality lathes and if Im not mistaken made lathes to be re badged for a number of other high profile lathe 'makers' beds at least. 38" long cross slide - yes that would take some scraping - but its not out of the question. Its like a 6ft SE . The first thing would be to determine the degree of wear - from that you can determine if its heavy roughing scrape or machining job. If it were mine it would be scraped - as its too long for any of my machines. besides the wear is unlikley to be more than 0.020" and that is soon bashed off 'as Chris would say. Youd want a few beers afterward mind :-)
Very nice. I enjoyed your progress. It appears you are very close to finish. Yes/No?
Next job on the Holbrook is to build up the cross slide and then refurbish the top / swivel slide. Ive another update to put up meanwhile.
All of the mag bases like your red one shown here have a common weakness. Down the center line is aluminium and the post can never be truly tightened. A good fix is to make a plate to cover the entire area of the base top face. Level off the top face and screw the plate down in each corner with a new center hole for the post. You will be amazed at how much more rigid the upright post is after the mod. The only catch for young players is the plate must be non magnetic (don't ask how I know) so stainless or brass/bronze is the best choice.
thanks Rob, I shall have a look into that - I have been wondering about making a base making use of the fancy neo' magnets. Still in the thought stage of projects that one !
@@lookcreations You can make the eclipse/mercer style push-push bases work with washer shaped neo magnets, i've done it, but the rotary switch bases require the magnetic poles to be diametrically opposed rather than the usual axial polarisation. Every neo cylindrical magnet I have investigated is axially polarised, so not useful and then there is the problem of getting a close fit into the iron base.
@@robbvk6es I was thinking of starting from scratch and designing the mag' to pull up internally to release - cam & lever type arrangement. Held in a non magnetic housing so it doesnt get the chips sticking to it. As I say, its not had much thought yet. Might be a nice project down the line.
I've checked your recent video, but I'm still baffled - when did working on a Holbrook suddenly require a (rather splendid) DS&G cross slide? Mind you - I remember when you were learning to scrape, and now you're a master! Very nice work.
I was asked by a chap if I would sort out his DSG cross slide out (instagram contact) - I said I was happy to take a lok and do what I could. It worked out well for both of us. Its going to be a far more useful machine tool now it has cross slide travel ! When I look back at the very first scraping I did on the Shaper - it still looks good compared to my what I am dooing today, different but its doing its job and very little sign of wear. Mind It gets oiled each time its used.
Good...🇬🇧👍
Thanks Glenn
You don't want to come to Australia to do some scraping on my DSG ? Idid make some enquiry into sending it back to DSG to be re scraped . But went out of business half way through the organization . Lucky escape .. mine is getting low in the tail stock . All original still original paint .
I should imagine it would be pretty short days with the commute :-) Maybe in the future I shoudl set up as a roving mobile scraper - kit the landrover out with a straight edge storage facility. Camp bed and start a world tour :-) Of course the dog would have to come !
Pleanty of room for a dog here !! Come over when it gets cold ! You can take my Nissan Patrol with it's camper for a run .. I am trying to learn about scraping here but it's very thin on the ground ! Just keep making videos . Thanks for your time
@@markfoster6110 I think Richard King is thinking about coming over if he can get the numbers .
@@markfoster6110 Are you on Facebook ? There are a few chaps that have built up a rebuilding group / club over in OZ - Marcus Christianson - hes on Instagram as well. There are quite a few. others involved and they share kit (I understand). I would sure love to visit Oz & NZ one day - dont think I could raise the txi fare to the airport at present let along the flight :-) Another scraping video underway - so keep watching. Cheers Mat
Would like to see you scraping the dovetails please
sorry about that, i didnt take any footage. I will try and find a section in one of my earlier videos where I scrape the dovetails on the Holbrook T13 lathe. Mat
Ive just checked through and there is little Ive got on scraping the actual dovetail faces - so keep tuned, I have to scrape the top / swivel slide' and will be sure to film the dovetails on that. I will have to check back further as the shaper rebuild tool head, ram and cross slide dovetails were all scraped and filmed. Take a look at the play lists on my channel. Thanks for watching. Mat
Thanks for looking! I look forward to seeing it. @@lookcreations
Nice work as always. What is your method of honing the scraper blade, and how often do you do it? I found I was honing mine every couple passes on tiny ways. Do you rehoning during passes on those big surfaces?
Good question. Well I use a diamond lapping plate on a slow grinder - after watching Robin Renzetti use one I made a very cheep copy - there is a video of it on my channel if you take a look back through. It is fitted with a #600 grit wheel and as such takes very little off of the carbide each time. Little and often is the key. I like a sharp edge so less force is required to take a cut and therefore I can retain more control over the edge direction etc. When I re-scraped the lathe bed (see the video in the Holbrook playlist), the roughing passes were deep and quick - sharpenning maybe every three passes over the 6ft length. As the face developed and more cuts were taken (smaller) I eventually got to put a fresh edge on each pass. Another thing to think about, 20mm wide scraper has less cutting edge than a 30mm wide scraper for a reason. So a larger / wider blade should enable you to find a sharp edge on the curve for longer. Straight push scraping is hard on the edges, so you have to learn to work around the scraper edge. I get more control with the curl cut I use and so its less force and the edge holds up longer. The last thing to concider - Cast Iron comes in many mixes, the gib cut from the old wood lathe bed was like butter, the saddle casting was much harder. My Holbrook lathe bed harder again. Sharpen the edge when you feel its losing its edge. I am filming a scraping video today for a small SE - I will try and cover this in the filming. All the best Mat
@@lookcreations Thanks for your reply Mat. I have an old Coborn scraper which has an integral lapping plate which I smear diamond lapping paste on. kzhead.info/sun/apigfLVljWR9qqs/bejne.html& My lathe scraping project is about 1/50th the scraping area as yours. kzhead.info/sun/gbp7c52OsZuup6M/bejne.html I did notice your curl cut technique. I find I dont scrape often enough to get great control, but the control improves through out each scraping session.
@@RotarySMP Those Coborn scrapers are a superior machien to anything else Ive seen. I hope to have a play with one some day or a big surface plate I have in need of scraping.
👍
thanks for stopping by.
@@lookcreations Allways do, to get my fix of Prussian blue 😀.
While I admire your work and think it's of excellent quality the idea that using any original surface as a true reference is not wise. As a drafter designer I can assure you that the machining tolerances on that machine were never tighter than +- .002. It would have been cost prohibitive to call for anything tighter than that and would never ever been called out. Good luck with your efforts and for your own piece of mind it will be far better than it ever was when produced! Your lathe will be super accurate compared to original!
The original machined surface is a starting point. Not having the bed and spindle to use required I use something original to get things going. If you take a look through the Holbrook rebuild, you can see a far better approach when the complete lathe is available to work from. This cross slide was badly worn to the point it wasn’t effective to use.
DSG the lathe they want to be .
Not found a dsg that was put together bad .
My 13x42 Dsg cross slide was too short because they needed to accommodate the power drilling attachment, compromised the rigidity.
I was surprised by the truncated fore leg of the far slide element. It has the advantage of creating 3 pads to a degree - but it will soon wear as the load is carried on a smaller footprint in my view.
11:20 how you measured it?
Most measurements at this stage were with a depth gauge. I was looking for .001” or less.
Hi sir I am from Malaysia I want learn to set up thread on DS,G M2 M3 4 5 6 all ok can set I am facing a problem M 1.5 M 2.5 3.5 4.5 please help me in this issue Thanks
HI, I wish I could, I do not own or run a DSG lathe - maybe try a search for DSG owners group on google / yahoo Im sure there is an on line forum where owners discuss the DSG lathes and someone may well be able to help. good luck. mat
There is a DSG owners group on practical machinist that can help you www.practicalmachinist.com/vb/
Thanks sir
👍 but ....R.i.p parallelism (Squareness) with top surface!
Watch again, it’s all kept within a 0.0003”
Cat
Paid job? Nice...
I was happy to have been approached - via instagram !
@@lookcreations - Couldn't have happened to a nicer guy. Sincerely, and continued thanks for your continued sharing with the world.