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Motor Temp Rise on the HF 8x12-14
druid_noibn
Hi All,
For those who might find it "interesting" ¨C I noticed the motor of the HF 8x12-14 was a tad warm and thought a check was in order. With a motor and ambient temp of 65F the lathe was turned on ¨C no metal turning. The probe was located on the upper part of the motor housing, between the motor body and the junction box. Without noting all of the readings, in the course of: 13 minutes ¨C temp rise 39.3F; 30 minutes ¨C 49.7F; 46 minutes ¨C 58.1F; 63 minutes ¨C 63F ¨C shut-down motor 66 minutes ¨C 65.7F I didn't run the motor unloaded yet. So the motor runs hot - an auxiliary fan might be in order. Take care, DBN |
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Re: About cutting threads
On Mon, Feb 26, 2007 at 04:27:05AM -0000, born4something wrote:
Hi Larry,Thanks guys! This has been an excellent thread (ahem) for a beginner like me. The only thing I can't see with this technique is how to accurately set my cross-slide to 29degs. Chris -- Chris Eilbeck MARS Flight Crew UKRA #1108 Level 2 UYB Tripoli UK Member #9527 LSMR |
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Re: Magnetic Problem
G'day John.
"They were notably heavy to lift." Perhaps you should have Weetbix for breakfast! You being in electronics may be able to get access to a hall effect magnetic field sensor and measure the field if any. Either that or put a sheet of paper over the area and dust it with iron filings. Have you noted that ferrous chips stick to the ways? I see that this could be a problem which ultimately will cause additional wear because the fine chips would not wipe away. Do we have to put in degausing coils? One good turn deserves another. Regards, Ian |
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Basic thread cutting questions
Cutting my first 1/4 20 threads on a piece of poor quality 1/4 inch
rod produced a few questions. 1. With the normal B/C gear in place, it wasn't possible to put the gear cover on because the BC gear was too large. Is leaving the gear cover off during thread cutting a serious enough safety hazard that one should go to the trouble of pressing out the bushing and key and replacing the gear with a smaller one? If so, do most people buy an extra bushing for this purpose? 2. I ground a 60 degree bit and left the tip pointed but wondered if the tip of the bit have a slight radius on it? 3. With about an inch of the 1/4 rod extended out from the chuck, I noticed that the rod would flex away from the bit somewhat though with light cuts the treads were acceptable for most work. Should one go to the trouble of using a dead center or should one use a live center even though the bit must be extended about 3/4 inch from the tool holder because of clearance issues? 4. Finally, given the time for setup etc., are there advantages to using the lathe for this operation over a simple die. Thanks for your help. |
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Re: Harbor freight 8x12 lathe
--- In 7x12minilathe@..., "born4something" <ajs@...>
wrote: me back as I headed down the street. Depends on their sales structureif the sales guy has room to move. I know several franchise businessesstore manager is struggling to make a weekly target and bad weather haskept customers away. I sometimes drive a hard bargain for the challengehave a before going to the store!!!!! Maybelisting # from an ad with a good price for model#44859. Now theywant539 as of 3-1Hey thanks that might work and am now working on the long face |
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Re: 3-jaw chick out-of-true?
Thanks -will try...!
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BW RTJ On 3/3/07 09:45, "born4something" <ajs@...> wrote:
Hi Richard, |
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Re: Way Lube, last post
Michael Taglieri
Chain-bar oil is also available in Home Depot, etc. (for chain saws). I
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bought some for my motorcycle chain and may give it a try on the ways. Mike Taglieri miket--nyc@... Everyone has his reasons. - Jean Renoir "The Rules of the Game" On Fri, 2 Mar 2007 16:54:58 -0600 "Marty N" <martyn@...> writes: I mentioned that I would, before weeks end, obtain and try some Way
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Re: 3-jaw chick out-of-true?
Hi Richard you cant use the tailstock centre as it has an MT2 taper and will not centre properly in the chuck. In the absence of any decent proper round stock (drill rod or similar)a decent 1/2" or so drill bit using the shank would be enough to indicate off.
My lathe out of the box gave <0.01mm (<0.4thou") so theres something seriously wrong if you get 50-100x that! If you still get those sort of readings It is just possible that the chuck is mismounted so remove it (protect the ways!) any try checking for any swarf or other debris and then remount and try again. Failing that remove the chuck and indicate off the spindle, it is just possible that the bearings are loose. If it genuinely is that then don't mess with it send the chuck back. Trying to file the jaws to suit is a no-no, the jaws are hardened so you would ruin your file ant you could not do it with any level of accuracy. Gerry Leeds UK From: Richard Stevens <rtjstevens@...>_________________________________________________________________ Match.com - Click Here To Find Singles In Your Area Today! |
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Re: 3-jaw chick out-of-true?
Hi Richard,
I'm no expert on the subject, but I would get more info from some people either at these groups or some websites (i.e. mini-lathe.com etc.) before you start filing on the jaws individually. If I understand it correctly, most 3-jaw chucks will show some runout. Not sure what is considered "acceptable" though. I've seen some sites where a Dremel type rotary tool is mounted to the tool post to lightly grind the jaws concentric. Lots of really knowledgable people in this group and others that will help you out I'm sure. Just some friendly advice. Good luck. Frank --- In 7x12minilathe@..., Richard Stevens <rtjstevens@...> wrote: tooling and metal not arrived -but my dial test indicator has...headstock chuck and test. It's a long way out and is visible by the naked eyealone - perhaps by 0.5 -10.8mm. Yes I've taken the centre out andrepositioned it -but still the same.(numbered) chuck jaws/teeth and to gently file down as appropriate) |
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Magnetic Problem
Hi all,
I've been using a magnetic base for my dial gauge. The base sits neatly across the ways. Thinking about it, that runs the magnetic flux lines down one way, across the spacer flanges in the bed casting and back up the other way. It seems to have left the two ways looking like the poles of a horseshoe magnet! I just rested some machined steel parts down the end of my bed where the t/s would normally sit. They were notably heavy to lift. Is this a common problem? Perhaps I should restrict the magnetic base to one way only but the bigger flat makes it beautifully stable. John |
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Re: 3-jaw chick out-of-true?
Hi Richard,
Welcome to the club. Don't start filing anything just yet! It's too hard to put all the little filings back. Gotta be pretty sure that's what you need to do before getting drastic. Firstly, I assume you're talking the regular (Sieg style) Chinese 7x12 here? If so, the tailstock has an MT2 taper. So how did you chuck the centre? It won't sit well in any parallel jawed chuck. What's the wobble look like if you stick something known to be cylindrical in there? Say a short water pipe offcut - or a bit of round bar when your metal arrives. Even a Philips head screw driver for now. At least they are usually pretty parallel down to the tip - not like the straight screwdrivers that have a forged bulge. Also, remove the chuck (3 awkward nuts at the back of the chuck) and check all is clean in the recess where the chuck sits on the flange. I'll bet the flange runs true. Does the chuck face? John --- In 7x12minilathe@..., Richard Stevens <rtjstevens@...> wrote: tooling and metal not arrived -but my dial test indicator has...headstock chuck and test. It's a long way out and is visible by the naked eyealone - perhaps by 0.5 -10.8mm. Yes I've taken the centre out andrepositioned it -but still the same.(numbered) chuck jaws/teeth and to gently file down as appropriate) |
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3-jaw chick out-of-true?
Hi, ignorant newbie here; just bought a new 7x12 lathe but as yet tooling
and metal not arrived -but my dial test indicator has... I decided to place the Centre from the tailstock into the headstock chuck and test. It's a long way out and is visible by the naked eye alone - perhaps by 0.5 -10.8mm. Yes I've taken the centre out and repositioned it -but still the same. What's the best advice? (All I could think was to take out the (numbered) chuck jaws/teeth and to gently file down as appropriate) Many thanks, Richard |
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Way Lube, last post
Marty N
I mentioned that I would, before weeks end, obtain and try some Way Lube against the others I posted about.
John had several sooooo I tested several. ISO 68, 100 & 220 from two vendors, Mobil Vectra series and Viking Sliderite. Here's what I found out. The standard way oils have less tackifier than chain bar oil, allot less but it's still there. It's not stringy at all. The chain bar oil, NAPA brand, is about 50 SUS units heavier and while that seems small, in a 55 degree basement shop it's enough to notice. But the biggest difference is in stick-slip. I don't know what exactly is in this stuff but the stick part is definitely less, about 1/3 that of than any of the other lubricants I've tried, oil or grease. Dynamic values are about the same as a heavy 20W or light 30W. In descending order for ways I like Viking Sliderite 310, Mobil Vectra #2, Napa chain bar, Mineral non-detergent 20W heavy, Mobil 1 15W50, {White Lithium Grease (Not on ways)}. For Leads and Feeds, in descending order I like Chain Bar Oil, Mobil Vectra #4 (ISO 220), Super-Lube synthetic PTFE, White Lithium Grease. (Greases not on exposed threads though) For the thrust faces and bushings and poly gears I like Moly filled wheel bearing. For unpainted non contact iron parts. Gun oil. Opinion varies Marty |
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Re: LED Lathe Light
I'm going to start looking like a salesman for surplus computers. In any case,
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check this out (a 5-pack for $18.99): <> It's an 8 rather than a 9 LED though. Now, if you're really serious, they have 50 packs for as low as $179.99. John ----- Original Message -----
From: rancerupp To: 7x12minilathe@... Sent: Friday, March 02, 2007 7:36 AM Subject: [7x12minilathe] LED Lathe Light HF currently has their 9 LED flashlight (93712-1VGA) on sale for $5. They are normally $10. I got one weeks ago and wish I had 5 more. If you are ordering from HF anyways, get one of these and make a flexible mount for your lathe. They are bright and last an extremly loooooong time on 3 AAA batteries. Rance |
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Re: Harbor freight 8x12 lathe
The calipers go on sale fairly regularly. If you can't wait, you can also get them at
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<>. Shipping is almost $7, though, but if you get more than one (or find other stuff), you may get the per-item shipping down to a tolerable level. For the record, I have no affiliation with surplus computers aside from having spent way too much money there over the years. John ----- Original Message -----
From: rancerupp To: 7x12minilathe@... Sent: Friday, March 02, 2007 6:55 AM Subject: [7x12minilathe] Re: Harbor freight 8x12 lathe Chris, You're not the only one that missed it. However I am about 2 weeks away from ordering. I missed the $16 dig. caliper too. Rance (sittin & watching the prices) --- In 7x12minilathe@..., "Chris" <house582@...> wrote: > > Hello all just missed a sale on the 8x12 for 439. Does anyone have a > listing # from an ad with a good price for model#44859. Now they want > 539 as of 3-1 |
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Re: LED Lathe Light
Jim RabidWolf
I'm buying a few, but at least a couple will have the led's pulled and
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replaced with UV led's ... Never know when CSI is gonna call <G> Rabid Uncle Rabid ( ) We Repair Electronic Speed Controllers For Asian Mini Lathes and Mini Mills "Just Crazy Enough To Get the Job Done" (Join Rabid's Lathe/Mill Controller/Mod's List!) (Also visit BarStockEngines - join us in building without Castings!) ----- Original Message -----
From: "rancerupp" <rupps@...> To: <7x12minilathe@...> Sent: Friday, March 02, 2007 8:36 AM Subject: [7x12minilathe] LED Lathe Light HF currently has their 9 LED flashlight (93712-1VGA) on sale for $5. They are normally $10. I got one weeks ago and wish I had 5 more. If you are ordering from HF anyways, get one of these and make a flexible mount for your lathe. They are bright and last an extremly loooooong time on 3 AAA batteries. Rance Be sure to check out for small mills and lathes. Yahoo! Groups Links |
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LED Lathe Light
HF currently has their 9 LED flashlight (93712-1VGA) on sale for $5.
They are normally $10. I got one weeks ago and wish I had 5 more. If you are ordering from HF anyways, get one of these and make a flexible mount for your lathe. They are bright and last an extremly loooooong time on 3 AAA batteries. Rance |
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Re: Harbor freight 8x12 lathe
Yeah, I could feel Chris' anguish. I just got stung on some
electrical gear I ordered late on Feb 28. I placed the order about 11PM on the wholesalers web site at the listed price. I received an email confirmation with that listed price. Next day they processed my order. Feb special had finished. Goods were debited to my card at 20% extra! We'll be discussing that early next week. Know how ya feel! John --- In 7x12minilathe@..., "rancerupp" <rupps@...> wrote: away from ordering. I missed the $16 dig. caliper too.have a wantlisting # from an ad with a good price for model#44859. Now they 539 as of 3-1 |
gerry waclawiak
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