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Re: HF Lathes
Some of the purists will probably weigh in on the side of getting a
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huge lathe, but I have found by 2 year old 7x10 Harbor Freight lathe has been just what I needed. I have no complaints. I've enjoyed learning how to use it and have made several tools and small parts for my antique clock repair hobby. I recommend, while you're making up your mind, you spend a lot of time at That site reviews the mini-lathes, shows in detail how to use them, how to adjust them, modify and tune them, and has some nice lathe projects. --- In 7x12minilathe@..., "film2paper" <film2paper@...> wrote:
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Re: R: Re: Drilling HSS 10% cobalt blank
MZT.Groups
My idea is to replace the saddle gibs with a pair of HSSco flats I broughtHi Gianni, why do you need "holes"? You need to make only some dimples for the set screws, I think they could be ground with a dremel. I would not use HSS cobalt flats to make saddle gibs: I fear that would mean all the wear will be on the saddle. I'm thinking about gluing a thin brass or else flat on the saddle side of the gibs, to gain hss advantages getting rid of its drawbacks. I really dunno whether it could work or not, just an idea. Marcello -- That "surplus shop" you were talking about.. is it anywhere near Turin? |
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R: R: Re: Drilling HSS 10% cobalt blank
Hi,
Flat for those strips is good. I'm not so sure about hard. That will ensure the eventual wear will be born by the ways rather than the gib strips. I know which I'd rather maintain or replace. :-) I plan to shim mine and lap. For now I adjusted the Sieg ones per www.mini-lathe.com/Mini_lathe/Tuning/tuning.htm <> . I found that technique fiddly but not a drama. It only asks about one thou of flexure. Having adjusted them beautifully at the tightest point I have several thou play elsewhere. So I know the underside of the ways needs a little lapping to get things uniform. John --- In 7x12minilathe@..., <gianni.carbone@...> wrote: brought in a surplus shop .I think the HSS flats are rigid enough to avoidbending under the pressure of the set screws. I think this is the primaryreason that saddle gibs are difficult to set. The surface of new two gibs aremounting. [mailto:7x12minilathe@...] Per conto di Charkie Walklin Sr"born4something" ajs@carbide single flute drill that will drill tool steel up to 65 R/c. If youchoose to do this make sure it's a solid carbide single flute drill. Just makesure that everything is rigid. Chatter is a killer on these drills. Go slowwith the RPM and give it a good feed. Not only do they drill straight butthey hold size pretty good. I have used them many times in the past(retired tool and die maker) and they work. on-line e non lasciarti sfuggire le numerose occasioni presenti!
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R: R: Re: Drilling HSS 10% cobalt blank
Charlie,
thanks for the infos. My idea is to replace the saddle gibs with a pair of HSSco flats I brought in a surplus shop .I think the HSS flats are rigid enough to avoid bending under the pressure of the set screws. I think this is the primary reason that saddle gibs are difficult to set. The surface of new two gibs are really flat and smooth I think this will help the smoothness of saddle motion. Naturally I need to make three holes in each gib before mounting. _____ Da: 7x12minilathe@... [mailto:7x12minilathe@...] Per conto di Charkie Walklin Sr Inviato: luned¨¬ 5 marzo 2007 21.23 A: 7x12minilathe@... Oggetto: Re: R: [7x12minilathe] Re: Drilling HSS 10% cobalt blank steam4ian <fosterscons@ <mailto:fosterscons%40ozemail.com.au> ozemail.com.au> wrote: --- In 7x12minilathe@ <mailto:7x12minilathe%40yahoogroups.com> yahoogroups.com, "born4something" <ajs@...> wrote: G'day Gianni & John. Look up the EMBHomebuilders group which is a relative of these machining groups. Its a moderated group but they can't be too fussy, they let me on it! They may be able to tell you what EMD can do and even demonstrate it by cutting your hole/s Gianni. One goood turn deserves another. Regards, Ian Hi Gianni,You might do a Google search for "hiroc" drills. They are a solid carbide single flute drill that will drill tool steel up to 65 R/c. If you choose to do this make sure it's a solid carbide single flute drill. Just make sure that everything is rigid. Chatter is a killer on these drills. Go slow with the RPM and give it a good feed. Not only do they drill straight but they hold size pretty good. I have used them many times in the past (retired tool and die maker) and they work. Good luck with whatever you do. Let us know. Cheers Charlie _,_._,___ -- Email.it, the professional e-mail, gratis per te: Sponsor: Cerchi un gioiello per te o da regalare? Sfoglia il nostro catalogo on-line e non lasciarti sfuggire le numerose occasioni presenti! Clicca qui: |
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R: Re: Drilling HSS 10% cobalt blank
Hi Mike,
Yeah, I'm inclined to agree. But it's not as much fun as getting into EDM! <G> I actually figured a single HiRoc bit at $30 would be viable if all you want at the end is a hole. But I like your idea. It even sounds like a viable use for all that carbide & metal dust from around the bench grinder! If it doesn't look promising in short time he's got a couple of fallback options identified. Time to pick one and get away from the keyboard... John --- In 7x12minilathe@..., Michael Taglieri <miket-- nyc@...> wrote: try something simpler. How about abrading the steel away as theysometimes do for glass? You build a wall of putty or something similararound the hole and fill it with an abrasive slurry, then you use a piece ofbrass tubing on a drill press as your bit. The tubing is softer thanthe steel but it gets charged with abrasive that does the actual cutting,and every time you raise and lower the tubing, it gets charged with freshabrasive. than can bewhat I've read. wire scrolltechnique which is more like an EDM variation of a bandsaw or the machinesjob. Same principle though. Mostly these are expensive CNC the offeringweb if you want to have a play. Otherwise, look for a firm and EDM blanks?equipment? ±ç³Ü²¹±ô¾±³Ù¨¤.. <> it/f veramente5000 prodotti in pronta consegna, consegna in 24h, assistenza ---~->
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Re: R: Re: Drilling HSS 10% cobalt blank
Michael Taglieri
If all you need is ONE 1/4" deep hole in a piece of HSS, I would try
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something simpler. How about abrading the steel away as they sometimes do for glass? You build a wall of putty or something similar around the hole and fill it with an abrasive slurry, then you use a piece of brass tubing on a drill press as your bit. The tubing is softer than the steel but it gets charged with abrasive that does the actual cutting, and every time you raise and lower the tubing, it gets charged with fresh abrasive. Cutting a hole this way would take a long time, but not as long as building an EDM machine.... Mike Taglieri miket--nyc@... Everyone has his reasons. - Jean Renoir "The Rules of the Game" On Mon, 05 Mar 2007 12:26:22 -0000 "born4something" <ajs@...> writes: Hi Gianni,
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HF Lathes
film2paper
Hello all, I have a shop but not a lathe. Is the Harbor Freight lathes
really ok for light duty beginning work like brass knobs and slotting some brass etc.? My work arounds are driving me nuts and it's time to get a lathe. I have some huge heavy duty woodworking machines, case iron, and I am reluctant to get any of the import machines. |
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R: Re: Drilling HSS 10% cobalt blank - EDM
Hi,
Model Engineering News described one at <> . I also have an 11-page PDF of a simple DIY EDM published in Model Engineer over July-August 1976 (with improvements published in October 1981). I'm not sure where I acquired that PDF document but please indicate if you're interested in a copy. John PS: In relation to the original question (yes, there was one), I suspect the Hi-Roc drill is the pragmatic results-oriented answer. OTOH, if you're using a real world need to rationalise some techno therapy, EDM seems more exciting! --- In 7x12minilathe@..., "roylowenthal" <roylowenthal@...> wrote: EDM rig. The project was so well done that they're offering the wholeis you'redefinitely in the "do not construct unless you really know what aluminumdoing" category. parts, which is frequently a problem in marine engine repair. It is |
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R: Re: Drilling HSS 10% cobalt blank - EDM
My personal favorite is the folks who use (& break) a 1/4" EZ-out
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trying to remove a frozen 1/2" bolt that broke. I think it was HSM that had a multi-issue article about building an EDM rig. The project was so well done that they're offering the whole article as a stand alone book. Some of the better quality carbide rotary files can effectively remove the broken EZ-out without too much trouble. Roy --- In 7x12minilathe@..., "Paul Moir" <paul.moir@...> wrote:
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Re: Homier "Speedway" 7"x12" Lathe.
You must have gotten their last one. I just checked their site and it
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says out of stock, shipment expected 3/15/2007. Did you order online or call them? Ed Having been satisfied with my lathe for about three years I have just |
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Re: Way Lube, last post
Marty N
Thank you Clifford Clavin. :) Marty, I just barely got through your post without hitting 'next'. I think I'll just wait for the last post on this subject that just says '________ is the best lube to use'. Hey, please don't take my comments as a knock, you bring up some very valid points. Thanks for your insight. And have a very slippery day.
From: rancerupp Uh, okay, your welcome, it think? I use motor oil in my motor. Transmission fluid in my transmission. Gear oil in the differential. So I think I'll use pancake syrup on my Ways. ;-) |
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Re: Harbor freight 8x12 lathe
Hello all just missed a sale on the 8x12 for 439. Does anyone have aI was finally ready to buy Friday (payday) and noticed the price change - great timing. I called them anyway to see if they'd give me the old sale price of $439, but the guy on the phone was just an order taker but he did tell me their current price for it is $499. Also, it's on Back Order. He said 20 days, but that's what they say when they don't have an expected date. Does anyone know of any place else that sells this model (other than the LatheMaster 8x14) which is priced to high for me ($749+$169s/h) even with the extra accessories and reportedly better service. Ed |
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Re: R: Re: Drilling HSS 10% cobalt blank
steam4ian <fosterscons@...> wrote: --- In 7x12minilathe@..., "born4something" <ajs@...>
wrote: G'day Gianni & John. Look up the EMBHomebuilders group which is a relative of these machining groups. Its a moderated group but they can't be too fussy, they let me on it! They may be able to tell you what EMD can do and even demonstrate it by cutting your hole/s Gianni. One goood turn deserves another. Regards, Ian Hi Gianni, You might do a Google search for "hiroc" drills. They are a solid carbide single flute drill that will drill tool steel up to 65 R/c. If you choose to do this make sure it's a solid carbide single flute drill. Just make sure that everything is rigid. Chatter is a killer on these drills. Go slow with the RPM and give it a good feed. Not only do they drill straight but they hold size pretty good. I have used them many times in the past (retired tool and die maker) and they work. Good luck with whatever you do. Let us know. Cheers Charlie --------------------------------- Now that's room service! Choose from over 150,000 hotels in 45,000 destinations on Yahoo! Travel to find your fit. |
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Re: 3-jaw chick out-of-true?
G'day John et al.
We now know the blood(y) line of this Three Jaw Chick; she of sired by Imprecise, out of True. My wife is a loverly lady (chick) but occasionally she has one jaw too many, a three jaw chick must be a fearsome beast. Seriously, Roy's advice is good, there may be the opportunity for a bit of gentle lapping but certainly no room for the village blacksmith. We gets what we pay for. Three jaw chucks were only ever seen as quick and easy for general work; precision requires either collets or a four jaw chuck with setting up. The most repeatable means of centering is to work between centres One good turn deserves another. Regards, Ian --- In 7x12minilathe@..., "born4something" <ajs@...> wrote: the compromises necessary in the spiral scroll design concept. |
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R: Re: Drilling HSS 10% cobalt blank
--- In 7x12minilathe@..., "born4something" <ajs@...>
wrote: G'day Gianni & John. Look up the EMBHomebuilders group which is a relative of these machining groups. Its a moderated group but they can't be too fussy, they let me on it! They may be able to tell you what EMD can do and even demonstrate it by cutting your hole/s Gianni. One goood turn deserves another. Regards, Ian Hi Gianni, |
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R: Re: Drilling HSS 10% cobalt blank - EDM
From the bookmarks (Warning, 1.4 mb PDF):
Issue 60 (p. 75-) and 63 (p. 95-) have some good information on do-it-yourself EDM. The circuit pictured in 63 is obviously an electrocution hazard not to mention a serious fire hazard. So this is definitely in the "do not construct unless you really know what you're doing" category. This is a great method to remove broken stainless bolts from aluminum parts, which is frequently a problem in marine engine repair. It is just about the only method that works if some poor soul tries to use an ez-out on the same. |
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R: Re: Drilling HSS 10% cobalt blank
Hi again Gianni,
One thing I forgot. EDM is usually done in a tank of some dielectric fluid. The fluid is also pumped around to remove the small metal particles from the vicinity of the cutting edge. The tank will impose size limits on your job. John --- In 7x12minilathe@..., <gianni.carbone@...> wrote: 5/16 in diameter.[mailto:7x12minilathe@...] Per conto di born4something imbattibili. Sfoglia il nostro catalogo on-line!
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R: Re: Drilling HSS 10% cobalt blank
Hi Gianni,
EDM=Electrical Discharge Machining. I'm no expert on it other than what I've read. Essentially, the metal is removed by a repetitive electrical discharge. Do a google search. In brief, there are a couple of forms. A sinker technique which simply sinks a hole through - can be done with a shaped electrode for shaped holes. Then there's a wire technique which is more like an EDM variation of a bandsaw or scroll saw only with wire fed from a feed spool to a takeup spool via the job. Same principle though. Mostly these are expensive CNC machines and can do pretty exotic stuff. But I've seen DIY articles on the web if you want to have a play. Otherwise, look for a firm offering this service. I suspect it's more suited to small quantities rather than mass production. It doesn't do dozens of holes per minute. More like dozens of minutes per hole! It has other neat uses too like accurately eroding small broken taps. Hardness of the metal is a non- issue. Anyway, do a google and check for local services. John --- In 7x12minilathe@..., <gianni.carbone@...> wrote: 5/16 in diameter.[mailto:7x12minilathe@...] Per conto di born4something imbattibili. Sfoglia il nostro catalogo on-line!
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R: Re: Drilling HSS 10% cobalt blank
Hi John
It is a plate about ?¡± thick (6 mm) the hole must be between ? and 5/16 in diameter. What is an EDM equipment? Gianni _____ Da: 7x12minilathe@... [mailto:7x12minilathe@...] Per conto di born4something Inviato: luned¨¬ 5 marzo 2007 12.47 A: 7x12minilathe@... Oggetto: [7x12minilathe] Re: Drilling HSS 10% cobalt blank Hi Gianni, That stuff's hard. What diameter and how deep? Any access to EDM equipment? John --- In 7x12minilathe@ <mailto:7x12minilathe%40yahoogroups.com> yahoogroups.com, <gianni.carbone@...> wrote: . <> it/f 5000 prodotti in pronta consegna, consegna in 24h, assistenza telefonica da tecnici specializzati Clicca qui: .<> it/cgi-bin/foclick.cgi?mid=5192&d=5-3 -- Email.it, the professional e-mail, gratis per te: Sponsor: Acquista i tuoi gioielli in tutta sicurezza ed a prezzi veramente imbattibili. Sfoglia il nostro catalogo on-line! Clicca qui: |
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Re: Way Lube, last post
Thank you Clifford Clavin. :) Marty, I just barely got through your
post without hitting 'next'. I think I'll just wait for the last post on this subject that just says '________ is the best lube to use'. Hey, please don't take my comments as a knock, you bring up some very valid points. Thanks for your insight. And have a very slippery day. --- In 7x12minilathe@..., "Marty N" <martyn@...> wrote: Lubricity or as some call it "oiliness"! Of all the traits of alubricant this is one that you rarely see a specification on. Usually fromsynthetic fluids suppliers but never from mineral oil suppliers. Unlikeviscosity which is a function of the fluids internal interplay within itself,internal friction, lubricity defines how the lubricant interplays with thematerial it is applied to, external friction. From a tactile view point itis hard to distinguish. To quantify lubricity as a separate function, theadditive must not interfere with the viscosity of the material it is added to. Inother words the fluid, before and after addition, would need to displaythe same viscosity absolute (centipoises) as measured on something like aBrookfield Cone and Plate test rig, then show a lower sine of angle slip toproof a claim of greater lubricity. Years ago it was found that Wynn'sfriction proofing, which claimed greater lubricity, was not much more thankerosene which just reduced the viscosity of the base oil it was added too.Yes it provided a lower sine of slip but also reduced film strengthsignificantly and greatly reduced viscosity and nobody at home knew thedifference. The same effect could be simulated by going down one or two SAE gradesor running the motor hotter by 20 to 30 degrees F.weight via catalyst cracking operations or reforming, more or lessmolecular branching, or selectively placing the distribution curve of thefluid via distillation , thus altering the specific gravity. As the SAE andISO rating systems are apparent viscosity systems their relationship to theabsolute systems hinges on this factor. Apparent viscosity in centistokes(cST) relating to centipoises (cP), that is centistokes X specificgravity = centipoises. Centistokes or Saybolt Seconds are used as industrystandards to classify a lubricant and if pumped or dripped the deliverysystem cares about its apparent nature but the lubricated surfaces proper onlycares about the absolute value.dampen vibration "chatter" and provide dynamic braking to the system,along with mechanical considerations. An additive that provides lubricity atthe expense of viscosity may improve the tactile "feel" while reducingthe dampened features. |
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