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Marty N
Hi Vince:
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I started with a 10" and as you see, building a 14" (15") but pretty much the same critter as you rightly suspect. If you take anything away from the set I built make it that it is flat and square, it's important. To get both with a stand off set screw system as they have the gib thus need be stiff. If they are allowed to bow or twist then you will not get full contact but point contact. That will wear things faster than hard gibs. You found out the factory gib isn't very stiff at all. Brass won't be either, but if your committed to that material then may I suggest that you compliment the set screws with two shims on the out side edges, one each end and full width of the saddle register? This is because it is a rare machine in which the bottom of the saddle where you fix the gib is parallel (end for end OR side to side) with the beds lower edge and while you can compensate for that to some degree with the set screws it makes it hard to get the gib square with the way. It will add support to the flexible plates. Unless you've worked the bottom of the way flat and parallel to the top you will find tight and loose spots. Make your adjustment over a tight area or it will bind latter when the saddle travels over those points. 90% of the work is done by the rear gib unless you have a rear mount tool post for parting or other work get that one as good as you can. Marty ----- Original Message -----
From: n1vc To: 7x12minilathe@... Sent: Saturday, April 07, 2007 9:51 PM Subject: [7x12minilathe] Re: I snapped a Carriage Retainer Marty, Way to go! My milling skills have a long way to go to duplicate. My lathe is actually a 7X10 but I jumped up to this group assuming the design is the same and I could thereby get more coverage on my question. Thanks, Vince --- In 7x12minilathe@..., "Marty N" <martyn@...> wrote: > > Vince: > > > > Bottom of second page should give you some idea. Your experience is exactly why I've done what I've done. > > Marty > > ----- Original Message ----- > From: n1vc > To: 7x12minilathe@... > Sent: Saturday, April 07, 2007 5:22 PM > Subject: [7x12minilathe] I snapped a Carriage Retainer > > > > I tried to snug up my carriage on the gibs. It had too much slop and I > tried to make the adjustments. I should have read the LMS manual first > and followed their procedure but I didn't. I overtightend one end and > I snapped it. The <1/4" strip with set screws seems to be made out of > cast iron as it was very brittle and snapped easily when overstressed. > My question is why can't I substitute a piece of plain old steel for > this task? Alternatively, I can easily order a replacement but it > might again be cast iron. > > Really my question is the part made of this material for economy or am > I missing some other point here? > > thanks much, > Vince > > > > > > > |
