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View Full Version : Want a general oppinion on this Riten live center



cuemaker
02-23-2010, 04:35 PM
http://riten.thomasnet.com/item/live-centers/super-accurate/12102?&plpver=1001&origin=advsrch&by=prod&filter=0

Its actually a bit cheaper than thier Regal line.....

It takes 5lbs to load the bearings......

oldtiffie
02-23-2010, 04:56 PM
It is accuarate to 0.00005" (half a tenth) but as it has an MT2 shank, you will need MT sleeves if your tail-stock taper is larger than MT2. As the sleeve has tolerances too as regards straight, round, parallel and concentricity that may be additive in full or in part to the "half a tenth" of the live centre.

If that is the case, you may be better or as well off with a lesser quality live centre with an MT taper to suit your machine.

If you want that degree of accuracy between the centre/d hole in the job and the diameter that you are turning or grinding, don't rely on just a hole drilled with a centre drill in a drill chuck in a tail-stock as they can - and do - "wander off". You will need to set the job up very accurately ("half a tenth" or "better") and bore the 60* centre hole to be concentric to the bore.

Any error in the job-to-bore concentricity will be additive to or subtractive from the concentricity of the live centre.

It is for this reason that good cylindrical grinders have non-rotating tail-stock centres. The cylindrical grinder may have "live" or "solid/still" head-stock centres. If "live", the centre is re-ground as required. If "dead" it is stationary with the job (driven by a well-balanced "dog") rotated about the head-stock dead centre.

lazlo
02-23-2010, 05:14 PM
Riten is about the best there is for live centers. With 50 micro-inch runout, you can actually measure microns on your lathe :D

That's a single bearing design that's meant for light axial loads (like a grinder). You might want to double-check the load rating to see if that's suitable.

Carld
02-23-2010, 05:17 PM
It looks like two bearings to me.

JCHannum
02-23-2010, 05:26 PM
The Regal centers are two bearing design;

http://riten.thomasnet.com/item/live-centers/-nbsp-standard-point-nbsp-nbsp/48602?&plpver=1001&origin=keyword&by=prod&filter=0

The center in the original post is for a grinder, where lighter loads are encountered.

lazlo
02-23-2010, 05:34 PM
The center in the original post is for a grinder, where lighter loads are encountered.

http://riten.thomasnet.com/Asset/a1064.jpg

cuemaker
02-23-2010, 11:45 PM
http://riten.thomasnet.com/compare/live-centers?&plpver=1001&categid=1001&prodid=&prodids=+3001015+3001021+3001022&itemids=+1186+1233+1260&origin=advsrch

That say anything about loads?

Scishopguy
02-24-2010, 01:26 PM
Original link spec sheet said 400LBS

DR
02-24-2010, 02:59 PM
The center in question has one main bearing and another needle bearing at the back.

IMO, this center would be overkill (price wise) for routine lathe work.

For half the money you can get a perfectly acceptable model from other vendors.

JCHannum
02-24-2010, 03:19 PM
While the weight of the workpiece is one consideration, the machining forces are another. At the bottom of the spec sheet, applications are given.

I agree that a center as good as the Riten can be had for much less. Skoda centers are hard to beat, and are about 1/2 the price of the Riten. Even they are overkill for most applications.

http://www.victornet.com/tools/Skoda-Live-Centers/192.html

cuemaker
02-24-2010, 04:25 PM
I was more after if it was ok for small manual lathe work... I have a unfair advantage in terms of price that makes it cheaper by $7 than the one shown in the link above for the MT2...Its brand new even...

rockrat
02-24-2010, 05:24 PM
Riten centers are made in my hometown of Washington Court House, Ohio just down the street and over a block from my cousins house. Looks like Misty and Lisa still work there. Reminds me of the good old days. Ahhhh.

Anyway, they are good centers. I took a tour of the place 20+ years ago and there was some neat stuff going on there. Now days I'm sure that they have a "world quality" brand of some sort. I seem to recall that they once had a fantastic warranty offer with the purchase of a center. I don't know what they offer now.

Its embarrassing but I have a Skoda for my lathe, it came with it. I always thought when I have a chance to buy another I would give them a go.

rock~