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Re: 7X14 mini-lathe
¿ªÔÆÌåÓý2nd Merts opinion.Im in Barcelona, Spain., and paid about 400€ for a 350 mm 7x14, maybe 7 years ago. Have about 0.006 mm TIR, which is very good, imo. Put a 125 mm 4-jay independent chuck on it, and very happy with it. ALL my work, or 99%, in steels. Very good results, using proper (CCMT) carbide inserts almost exclusively. I use a BXA toolpost, and 16 mm toolholders, from Chronos. Lathe was cnc, no temporarily used as a polishing lathe only. Cannot really do big steel workpieces, above 120 mm, and I now have an industrial 12x for heavy pieces. ? |
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Re: 7X14 mini-lathe
MERTON B BAKER
Dunno what others experience, except for the complaints I read about here,
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but the experience I've had with the Chinese 7x lathes, one 7x10 from HF, One 7x12 from Homier (RB), and one 7x12 from Grizzly, is that they all worked much better that I expected from the amount of money I paid, and continue to do so. I was especially pleased to find out that the 7x12s are really 7x14s. Difference of opinion is what horse racing is all about, however. I don't know how many of these machines are in use in this country, let alone others, but adding up all the complaints would seem to indicate a very small percentage, and surely some of that would be from some who do not realize that they are looking in the mirror. To expect less than half a tenth runout from a $400 7x12 lathe seems unrealistic to me. Paying what a machine with guaranteed half-a-tenth runout would cost, is equally unrealistic, I'm a retired small town schoolteacher. Rejoice & learn. Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of lathe_7x14 Sent: Monday, October 10, 2011 6:04 AM To: 7x12minilathe@... Subject: [7x12minilathe] Re: 7X14 mini-lathe I think it is really a matter of getting what one pays for and that it would be unfair to blame the supplier. It is generally understood that between the Chinese factory and the buyer the box get's transshipped many times and bounced about, and things do come loose. Usually the first time the box gets opened is when it reaches the buyer and he does the 'quality check' at this end. I have seen one supplier who for ???100 offers to open the box and 'prepare' the lathe, but whether that includes a full functional test, I don't know. When I first looked at the Chinese lathes it was suggested that the best way of looking at them was as a 'kit of parts' and one has to be prepared to do some work on them. The fact that I, an 'expert' after one whole days experience, managed to clear all the problems, shows that they were fairly simple to resolve. I think the best approach is to examine the box on the pallet for any external signs of damage, before signing the carriers paperwork. The polystyrene packing is very thin, but bruises should show up on the outside of the cardboard box. After unpacking photograph anything you don't like and immediately inform the supplier. In this case the supplier was really on the ball and helpful and I would recommend them to anyone. They even told me to keep the two undersized tool holders and immediately sent me the correct replacements. So I have nothing but praise for the supplier and do not think it would be fair to penalise them in any way. I am a happy customer. --- In 7x12minilathe@..., "Michael Jablonski" <michaeljab@...> wrote:
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Re: shaft and bushing for the B/C change gears
¿ªÔÆÌåÓýI have done quite a bit of thread cutting on my
7x14 MicroMark lathe and have not had any problems. Not sure I understand what
part you're talking about. Pictures?
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Chuck in E. TN |
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Re: 7X14 mini-lathe
lathe_7x14
I think it is really a matter of getting what one pays for and that it would be unfair to blame the supplier. It is generally understood that between the Chinese factory and the buyer the box get's transshipped many times and bounced about, and things do come loose. Usually the first time the box gets opened is when it reaches the buyer and he does the 'quality check' at this end. I have seen one supplier who for ?100 offers to open the box and 'prepare' the lathe, but whether that includes a full functional test, I don't know. When I first looked at the Chinese lathes it was suggested that the best way of looking at them was as a 'kit of parts' and one has to be prepared to do some work on them. The fact that I, an 'expert' after one whole days experience, managed to clear all the problems, shows that they were fairly simple to resolve.
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I think the best approach is to examine the box on the pallet for any external signs of damage, before signing the carriers paperwork. The polystyrene packing is very thin, but bruises should show up on the outside of the cardboard box. After unpacking photograph anything you don't like and immediately inform the supplier. In this case the supplier was really on the ball and helpful and I would recommend them to anyone. They even told me to keep the two undersized tool holders and immediately sent me the correct replacements. So I have nothing but praise for the supplier and do not think it would be fair to penalise them in any way. I am a happy customer. --- In 7x12minilathe@..., "Michael Jablonski" <michaeljab@...> wrote:
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Re: shaft and bushing for the B/C change gears
First remove the shaft assembly off the lathe. Now we limit the damage
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to the machine. (Don't ask how I learned this!) Place the shaft over a short pipe. I used a PVC cut-off that was 25 or 30 mm long. It was just the right diameter. A few squirts of penetrating oil to give it some lube. Then a drifter was used that fitted to the bottom of the threaded hole and drifted gentle it out. An alternative is to place a suitable bolt in the threaded portion and strike that. I did not have a suitable bolt hence my drifting from the bottom of the hole to protect the thread. The danger is you can break the bottom out of the hole which is bad. A third alternative which I feel might make the situation worse is to have a drifter that fits the 8mm hole of the bush. I avoided this method as I felt if it stated to mushroom the metal of the shaft it would expand onto the bushing or reduce the opening of the threaded portion. Just my 5 cents. Andrew in Melbourne. On Sun, 2011-10-09 at 11:28 -0700, Ian Newman wrote:
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Re: shaft and bushing for the B/C change gears
Hi Paul,
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I've had exactly the same problem. I managed to tap the shaft out of the bush using a brass drift. I cleaned it up and it was usable again. The real problem is that it is a steel shaft running in a steel bush. I made a complete new banjo to Richard Hagenbuch design and used a phodphor bronze shaft. Since then I have not had any problems. Mosre info on the redesigned banjo can be found here: Mike --- In 7x12minilathe@..., "jaspercan7" <jaspercan7@...> wrote:
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Re: shaft and bushing for the B/C change gears
I had the same problem a few months ago. I had to use a drifter to get
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things apart. I cleaned up the parts and gave them the shaft a polish as it was scored. It looks like a lubrication problem so I tried white lithium grease on that shaft. I am interested to see if others also experienced this problem. I also cleaned my gears as I had greased them up when I go the machine which was a mistake. As most are nylon/plastic they don't need grease which the swarf sticks to. Cheers, Andrew in Melbourne On Sun, 2011-10-09 at 16:17 +0000, jaspercan7 wrote:
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Re: 7X14 mini-lathe
¿ªÔÆÌåÓýSounds
like a lot of problems right out of the box. Would you mind telling us where you
purchased this lathe from? It might help other in deciding where they purchase
their first lathe from. Many newbies might not want want to have to deal with
repairing or adjusting so many things on a new lathe.
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Thanks,
Michael
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Re: shaft and bushing for the B/C change gears
¿ªÔÆÌåÓýHappened to me too! Didn¡¯t make sure it was oiled often enough I guess.
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Don¡¯t fuss with it too much! You can get news one from Little Machine Shop
for just a few bucks.
for? $3.84
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for $ 5.94
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Of course, you could make these yourself if you had a working
machine........
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Bob
? From: jaspercan7
Sent: Sunday, October 09, 2011 9:17 AM
Subject: [7x12minilathe] shaft and bushing for the B/C change
gears ?
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I was doing some general turning under power feed yesterday, nothing
elaborate, and all of a sudden the lathe stalled. After much investigation I
finally diagnosed the problem: the B/C gear bushing has somehow fused or stuck
itself to the B/C gear shaft on which it rides. Seems absolutely welded. Right
now I have it soaking in wd40. |
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Re: shaft and bushing for the B/C change gears
¿ªÔÆÌåÓý?Replacement is only $3.84 from . ?I'd say to just think of the replacement part? as a kind of reverse Murpy's Law: If it no longer matters whether or not you can get the old bushing off without mangling it all up, it will of course come off with no real drama. Only if there is no replacement easily available does Murphy's Law apply.? Similar to the "butter-side-down" rule for dropping your toast or the fact that it is exceedingly rare for your car to conveniently break down right in your driveway, or perhaps in front of your favorite local garage. ?When mine seized up I used two flat screwdrivers to force it off, then I lightly round filed the ends to clean up the prying marks, and wetsanded the shaft down a bit until it was a sliding fit again. Since then I have made a point of using lots of white lithium there ever since. This is exception to the mostly true opinion from those you may have read about here who have decided those plastic gears need no lubricant... except for that metal on metal bushing you discovered, that too is only mostly true... :-) ?Good Luck! ?John Z. Of York, Pa. On 10/9/2011 12:47 PM, jaspercan7 wrote: ? |
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Re: shaft and bushing for the B/C change gears
Ian Newman
--- On Sun, 9/10/11, jaspercan7 wrote:
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Re: 7X14 mini-lathe
lathe_7x14
--- In 7x12minilathe@..., "copascetic1" <copascetic1@...> wrote:
I have had my new 7 x 14 for a week now. There were several faults when it arrived (as I had expected). The DRO wasn't working and that turned out to be an intermittant connection on the Display board. The usual fault is the sensor plug working loose during transit. The speed sensor had been maladjusted and the interrupter vanes almost touching one side of the opto switch. The mounting for the sensor has adjustment holes, so that wasn't a big problem, to center the switch gap around the vane. The power to the spindle was also intermittent and that was because a connector had worked loose on the main PCB board, next to the sensor plug. The MT2 hole in the tail stock had not been bored deep enough and it was ejecting the centre, effectively losing a good 20.0mm of travel. I had read about this problem elsewhere and cut about 20.0 mm off the end of the Morse adapter sleeve for my chuck and that fixed it. One could gain about another 15.0mm of travel with a smaller diameter Morse taper, but I am happy with it as it is. I also ordered two spare tool holders for the quick change tool post, making a total of five. The two spare ones would not fit on the dove tail of the QRTP and the supplier changed them for me. When the tool holders are set to the correct height, they foul the QRTP clamping lever, so at some stage I need to find some shorter socket headed screws, for tool height adjustment. I found it a bit finiky pushing the sling dovetail out of the block each time I wanted to change a tool holder, so I have fitted a spring on the plunger so it always pushes the dovetail out when taking off the tension. That is about it for the moment. I did some real turning on it yesterday and today and I am well pleased with the lathe and find it excellent value for money. |
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Re: shaft and bushing for the B/C change gears
I should be more specific. In addition to suggestions to keep it from happening again, are there any recommendations for non-destructive ways of separating the stuck bushing from the shaft?
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--- In 7x12minilathe@..., Jerry Durand <jdurand@...> wrote:
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Re: shaft and bushing for the B/C change gears
Jerry Durand
polish shaft and use more lithium grease?
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On 10/09/2011 09:17 AM, jaspercan7 wrote:
I was doing some general turning under power feed yesterday, nothing elaborate, and all of a sudden the lathe stalled. After much investigation I finally diagnosed the problem: the B/C gear bushing has somehow fused or stuck itself to the B/C gear shaft on which it rides. Seems absolutely welded. Right now I have it soaking in wd40. --
Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
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shaft and bushing for the B/C change gears
I was doing some general turning under power feed yesterday, nothing elaborate, and all of a sudden the lathe stalled. After much investigation I finally diagnosed the problem: the B/C gear bushing has somehow fused or stuck itself to the B/C gear shaft on which it rides. Seems absolutely welded. Right now I have it soaking in wd40.
Anyone had a similar problem and can give any advice? Thanks, Paul |
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Re: Duplicated Messages
Frank von Furstenrecht
Andrew,
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The messages I tried to sent you never did go out. ?I had a problem with my email system, for some reason still unknown it stopped working. ?I did not change anything because I never had a problem with it. ?Yet is suddenly stopped sending mail out. It never required it before but now it had to have my passwords in order to work. ?Once I entered them it no longer requires them, kinda strange. Hopefully it will stay working now. Frank On Oct 8, 2011, at 2:24 PM, Andrew wrote:
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Re: Duplicated Messages
Yep. It worked,
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Andrew On Sat, 2011-10-08 at 16:04 +0000, fmvf@... wrote:
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Duplicated Messages
I just want all to know that I did NOT send the "Black & Decker" message twice. I have no idea how the message appeared for a second time.
I received a message from Andrew Franks and I replied to it, for some reason it is still trying to go out. I hit the "send" button about 30 minutes ago and it is still trying to send it. Let's see if sending this will work. |
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Re: Moments of Terror in Machining
MERTON B BAKER
The process that made Al inexpensive was invented here. In Ohio, I think.
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Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of Jerry Durand Sent: Friday, October 07, 2011 1:08 PM To: 7x12minilathe@... Subject: Re: [7x12minilathe] Re: Moments of Terror in Machining I picked up an aluminum bar yesterday and was surprised to see "Made in USA" on it. Didn't know we had any smelters left. On 10/07/2011 08:00 AM, john brookes wrote: yes Mert, except few things are made in USA anymore.-- Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand ------------------------------------ Yahoo! Groups Links |
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Re: Moments of Terror in Machining
¿ªÔÆÌåÓýI bought my grinder from HF and it has no vibration, the wheels seem
balanced fine!
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It does get warm after using it awhile; not surprising when I live in
Tucson, AZ where summer temperatures are 110F in the shade!
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Bob
? From: john brookes
Sent: Friday, October 07, 2011 8:08 AM
Subject: Re: [7x12minilathe] Re: Moments of Terror in
Machining ?
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my hf tool grinder has zero tendency to walk. I just placed it on a table and
it has no vibration. |