Gb will only offer closer fit threads upon special order. What part of the lathe is used to set the feed rate of the. This video will show you how to fix backlash on lathe crossfeed y axis adjusting backlash on a smithy machine. The nell 1937 model south bend 9inch book, that is too much slop in a cross feed screw to have. Machining a new bronze cross feed nut for a 1909 f. Cincinnati bickford drill press table raising mechanism duration.
After the second try on making an aluminum plug to press fit clearance, i noticed there is play in the cross travel part. I need to fix the backlash on the cross and topslide on the lathe the 85y old one it currently has 8tpi acme or something like that, square topped threaded screws working onto a tapped castiron block which is the slide itself. Most circular feed andor positioning kinematic chains used in cnc machine tools consist of. Judging from the appearance of the mount, and the little cutting work ive done so far, the compound seems to be firmly anchored to the crossslide. On a milling machine a 3axis dro shows the x and y positions of the mill table plus the zaxis position of the cutting tool. On a lathe, a typical 2axis dro shows the positions of the carriage and the cross slide. My first lathe had acme lead, cross feed and compound screws that were worn so bad it looked like sharp vthread in places. Logan 820 10 lathe cross slide screw adjustment needed showing 19 of 9 messages. This version of the c4 lathe, configured as the m4 lathemill combo, has slots that run the length of the crossslide. You may have to turn the handle half a turn before the cross slide begins to move, but once youve taken out the backlash, as long as you keep turning in the same direction the relative measurements you get off the dial graduations will. Meaning if you back the cross feed out to move the carriage back to take another cut, you. This is the essence of software backlash compensation, which is.
Dros help prevent common errors such as misreading the hand wheel dials or losing count of hand wheel rotations. Im following the lathe refurbishment guidebook from illion 2011 and im getting ready to do the saddle just finished apron. The dial on this handle indicates the relative position of the cross slide. Joe made a replacement tailstock ram for it, and ive bought a new chuck and toolpost, and a few other bits. In the introductory paragraphs it was mentioned that there are cases where the amount of backlash is known and it is always known which side of the screw thread is contacting the nut thread, and in these cases it is possible to simply subtract out the backlash where appropriate.
Adjusted the cross slide nuts, wedge type adjustment. The method described above, should be used whether you do the upgrade or not. I look forward to seeing your machine from when they made them with no corners cut on quality. The feed screw nuts wear fairly quickly, easy to take it out, fit it to the feed screw and check for wear.
More expensive lathes have power feed capability on the cross feed but this lathe does not. Heres info on what it is, how it is measured, and what the designer of such systems can do to reduce it. It was in need of a good cleaning and was missing a few parts, but all in all fairly sound. Using conventional vedged slides, the compound slide assembly had good sized zeroing micrometer dials and a split crossfeed screw that could be adjusted to remove backlash. All components are in excellent condition, very minor thread or gear wear. The feed direction lever or feed reverse lever controls the direction of automatic feed on the lathe.
South bend lathe cross slide screw for 9 inch or 10k model a or b. The cross feed and compound dials were converted to free spinning with friction lock easy to do, works well, replaces the friction spring under the dial. A picture story book to help you dismantle and reassemble your sieg sc3 minilathe arc euro trade ltd. Backlash in the x or y axis of machining centers is most obvious when milling full circles.
Bruce wrote in message book sbce3450how to run a latheenglish g4986machine shop practicevol. Interestingly, it is less important on the cnc lathe lead screw, because most cnc lathe machining on the leadscrew occurs in one direction only, towards the headstock. As you can see from the picture, i made brackets to use it as a cross feed readout on my old logan model 200 lathe, and it looks like its going to work well. Well illustrated with vintage working operations delivers the ultimate teaching photos and. Some of it was from backlash in the feed nut itself, but most of it was between the.
Logan 820 10 lathe cross slide screw adjustment needed. You cannot turn this hand wheel when the automatic feed is engaged. Repairing the crossfeed miter gear on an atlascraftsman. Sc3 minilathe lathe milling machine model engineering.
The cross feed advances the cutting tool into the work at a right angle to the workpiece by means of a leadscrew and handwheel. Lathe bed the lathe bed is made of highgrade cast iron fcd25. The aluminum wheel was painted with the same color from apron. With the disengageable feature, handwheel backlash increased to 4 degrees.
The z axis is the longitudinal axis, while the x axis is the cross slide axis. Self etching primer two parts for aluminum was first applied and then marine gray spray. My original reason for getting a lathe was to make items related to my microscope hobby but i got into fiddling with lathe related stuff. By selling directly to end users we provide the best quality products at.
Bed ways are good with minor rust spots here and there, compound only has. The premier source of parts and accessories for mini. Use this handle to advance the tool into the work and for facing cuts. We guarantee this product to be free from defects in materials and. If this is loose it will allow the nut to slip back and forth, giving you horendous backlash. It is right behind the compound on top of the cross slide. Backlash is annoying on a manual lathe, but it is very important on the cross slide of a cnc lathe. Feed direction lever spindle speed levers control panel 3jaw chuck steady rest light follow rest cutting fluid nozzle quick change tool post compound slide tailstock lifting hole wcover thread dial spindle onoff lever feed halfnut lever selection lever cross slide carriage feed speed dials lifting hole wcover fully enclosed. Threads and gear on screw are in very good condition. In other words there is little opportunity to make another part. Backlash is the result of a gap between the handle and the worktable on your lathe. However, its common for the screw and nut to be replaced several times during a lathes lifetime so one without play does not necessarily indicate a littleused lathe.
It covers the assembling and disassembling of the entire lathe, and it. Hi all, this is one for the experts, johns, robin, etc. Repairing the crossfeed miter gear on an atlascraftsman 12. This showed up as backlash in the feed screw when you grabbed the toolpost and applied force in alternate directions you could see the entire cross slide move back and forth. Ac motor with speed adjustment through frequency, mechanical gearbox and a. The two axes of movement associated with the lathe are the z and x axes.
Four tbolts are used in these slots to attach the compound. This arrangement provides a full 7 of range, just a fraction under the capacity of the. The articles cover both compound and cross slide dials, and will work on the 405 and 415. I have only had my lathe for about a year and so while i would like to reduce the backlash in the cross slide handwheel the lathe is still in very good order being nearly brand new except for lots of swarf. The g9972z is slightly larger and has a powered apron from a slotted lead screw, but still no cross feed. Slack in the feed screw to bracket is adjustable, you should be able to see if the gap between the micrometer dial and the bracket changes when you turn the handle back and forth. With a maximum jaw opening of 6, this cross slide vise holds your work pieces steady and tight. The g0602 is extremely popular, but lacks a full qc gearbox, cross feed and tumbler reverse. Brass nuts too, so its not just a matter of the materials they are made from. Lathe lathe cross feed screw the trout underground. Milling attachments used in milling machine axibook.
This is one of the most used part of the lathe and it will be unsurprising if some play is not evident. The end brackets are hardened steel and have a very small slotted set screw to help hold them on. This durable cross slide vise is ideal for use in the home garage or professional shop. Also make sure when cutting that you have the feed screw against the backlash. The g0752 is the g0602 with a 3phase motor and vfd. Some higher end bench top machines are now starting to offer power crossfeed as well, and this is a very nice feature if youll be facing larger diameter. Make sure you always turn the leads screw toward the cut, never back away and then make a cut. There is no more slop in the vice than there is in the chuck assembly of the drill press it is on. Bushing, ball crank, pin, retaining nut, and small dialcollar with set screw over all good condition.
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