PIV/ Werner Reimers gearbox overhaul

An old PIV/ Werner Reimers gearbox was presented to us for inspection. It is a right angle gearbox with a 1:1 ratio and a 1 input/ 2 output shaft configuration. In the application, the gearbox input shaft is vertical and the two outputs are horizontal. The output shafts counter-rotate. They drive two screw conveyors which move and compact wood chips. The gearbox is part of the hopper of a biomass combustion installation by Kara Energy Systems (link). This is a pretty old installation, delivered in 1980.

Gearbox main data:

  • Type nr.:  L51 B88-M-1-0
  • Serial nr.:    446 172 G2
  • i=      1
  • P=    4,37 kW
  • n2 =    50 rpm
  • M2 =    834 Nm
  • Lubrication: Oil, Mobilgear 629 (replaced by: Mobilgear 600 XP 150)
  • Filling quantity:     4 liters
  • Oil service interval:  2500 operating hours
  • Gear type: Klingelnberg (Cyclo-Palloid)

 

The gearbox was taken out of the installation because it had completely jammed and did not move anymore. In the time leading up to the failure, noises were heard from the gearbox.

The gearbox had been rebuilt in 2007.

The general approach was to do a disassembly and inspection, report the results and decide on whether to rebuild or replace.

First step was to remove the side cover:

What we saw was a big mess. Much dirt and not a drop of oil. Obviously wood dust had worked its way into the gearbox and likewise, the oil had found its way out! The input shaft could only be rotated a very small amount before it jammed. Metal chips (likely from a bearing cage) were present. We knew right away that this was not going to be an easy fix.

From experience we know that a rebuild was going to be costly. Because of the age of the gearbox, a direct replacement was out of the question. PIV/ Werner Reimers is now Brevini (link), and this type of gearbox has gone out of production a long time ago.

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Gema LZ 160 lathe/ Drehbank

Gema machines were built in Germany until somewhere in the 70’s or early 80’s. The company then went out of business. Up until approx. 2006 parts were still available, but this was also discontinued. At that point also the entire archive, drawings, all original factory information was thrown out. I would have loved to get that archive, but it’s gone forever, unfortunately.

Models:

  • P160
  • LZ 140
  • LZ 160
  • LZ 170
  • LZ 200

I will concentrate on the LZ 160 model.

It is a medium sized model weighing about 800 kgs. The machine was available in three “between centers” lenghts, 750, 1000 and 1500 mm.

We have 4 of these machines. One is in fine working order, the other 3 are not very good. Problems include: worn beds, worn mechanisms, broken teeth on gears in feed gearbox, broken backgear shifter components. One other machine may be put back to working order, but for the other 2, it looks to be not feasible.

The Gema machines were no “A” quality machines like Weiler, Schaublin etc. Although they work absolutely fine, they lack the refinement of a top quality lathe. Having said that, the ergonomics are very good. The quality of the castings is not the best (porosities). The machines tend to be leaking oil, often from inadequate design to keep the oil in.

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Our best machine (picture) has collets and a lever-operated collet closer. I have not yet seen this on other machines.

Also, on older machines the feed gearbox was Norton type, while later machines were fitted with lever-operated gearbox.

Van Norman No. 6 milling machine

Here is our nice Van Norman milling machine.

This machine was owned by 1 private owner for more than 40 years and saw little use.

This machine is for sale.

  • X, Y and Z all hand operated (no power feeds)
  • Swiveling head, for horizontal and vertical milling
  • Very heavy sturdy machine for it’s size

In good working order. A fun little machine for hobbyist or professional with occasional use (toolmaking, construction etc.).

Several options.

https://en.wikipedia.org/wiki/Van_Norman

http://www.lathes.co.uk/vannorman/

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More / better pictures to follow!

Lorch AV1K / A6K / AVIK lathe/ Drehbank

Here is our Lorch lathe.

This is a very nice small lathe. It was owned for 40+ years by 1 private owner and saw little use. It is original and complete. No restoration needed.

  • Full set of collets with conventional collet drawbar
  • Original cast iron one-piece stand (not very often found)
  • Separate banjo + toolrest, supposedly for woodturning.

http://www.lathes.co.uk/lorch/page6.html

This machine is for sale.

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(more and better pictures to follow)

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KTB (Kantonales Technikum Biel) lathe/ Drehbank

Here is a very nice old machine built by a remarkable builder: Kantonales Technikum Biel, which is actually a school. How strange that a school would build metalworking machines, actually at the quality level of, for example, Schaublin.

It looks like a very high quality machine. I doubt whether it was ever restored.

This machine looks in pristine condition. I would have loved to buy it, but unfortunately, it was already sold.

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These machines are quite rare, and one in this condition with all the options and stuff is still more rare! About these machines, there is next to nothing on the internet. Also no information on the lathes.co.uk website.

http://www.tafeltennis-fotoalbums.nl/main.php?g2_itemId=4293

Heid – Sensitast/ Sensimat/ Neomat lathes

Heid from Austria made very unique and interesting lathes.

The Sensitast/ Sensimat machines had the unique feature of separate ways for the tailstock. This allowed the main bed ways to be completely covered, which reportedly reduced wear to almost zero.

This machine layout required a lot of extra material to be used, and thus, these machines were very heavy.

The machine shown below has a revolver type tailstock.

2014-02-10_195942

These machines only come up for sale very rarely. Not surprising, as they were extremely expensive when new, so they were sold in small numbers.

The separate ways had a number of advantages, another one being that steady rests could be placed anywhere along the length of the workpiece without interfering with the movement of the carriage.

The thread cutting leadscrew is placed in the center of the main bedways. It is fully covered from the environment and continously lubricated. Also it does not exert a force couple on the carriage, making thread cutting more accurate and minimizing wear

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Also there is a version which seems to be a “budget” type perhaps, it has the same basic layout but does not bear the “Sensitast” tags. The headstock side of the machine is noticably smaller and different from the “Sensitast”.

aparte heid

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aparte heid2

Sensitast machines were often used for copying. The copying equipment is shown below. The feeler is mounted on a feeler arm. The workings of the Heid copying is very well explained here: lathes.co.uk/heid.

heid feeler01.JPG

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Also there was the option of relieving. This required an additional gearbox top left of the headstock, a drive shaft, and a special cross slide. Also this option is well explained in this link: www.lathes.co.uk/heid. Relieving would be used mainly for manufacturing milling cutters, taps, dies etc. for metal- and woodworking machines. This link shows the operation: relieving lathe .

 

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Here is a very fine and seemingly complete example. This machine looks almost like new. Note the shaft between centers above the tailstock carriage. Here the copying template is fitted. Also this machine is fitted with the relieving equipment.

Heid_01a

Heid_02

Heid_03

We have full documentation available for both the Sensitast and Sensimat machines. If you need this, please drop us a line.

sensitast_01

The Sensimat is actually the full copying version of the Sensitast:

Sensimat_01

Sensimat_01

The Neomat is an entirely different beast altogether. The unique feature of this machine type is that the headstock and tailstock have an adjustable center height:

Neomat_01

Neomat_03

(source: Widmers)

The aim of this feature is to have a very large range in center height. For small diameter pieces, the center height as adjusted to be small, so the machine is very rigid. With large diameter pieces, the center height is increased to the value needed to accomodate the workpiece. The reason for slanting the surface on which the headstock and tailstock are mounted, is to move the workpiece further back as the diameter increases. This will keep the resulting force on the cutting tool always between the bed ways:

Neomat_02

Here is a video of a Sensitast machine working in copying mode (with a very strange and dangerously mounted chuck on 3 “studs”… Sensitast copying

Schaublin 102-VM lathe/ Drehbank

Here is our Schaublin 102-VM lathe

We recently acquired this lathe. It was privatly owned by a single owner for more than 40 years.

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An interesting feature is that it is a 4000 RPM model, which was a factory option. This option calls for a large, 3-speed motor:

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The machine is completely original and needs no restoration, except for a few small repairs. There is a little bit of oil leakage coming from the changewheel gearbox, and the lever on the apron has a bit of play, this will be fixed by a new parallel key. Scraping marks on the bed are still clearly visible.

The machine has a full set of collets, lever-operated collet closer, lever-action tailstock, and several 3- and 4- jaw chucks.

We have not yet decided whether to sell or keep this very nice machine. Inquiries are welcome.

Here are a few sites about Schaublin:

http://www.lathes.co.uk/schaublin/

http://www.modelenginemaker.com/index.php?topic=271.0

http://anglo-swiss-tools.co.uk/schaublin/