go to the home page

go to the page above this one

Slip gauges

Slip gauges are small pieces of metal that are made to be a very precise thickness. They come in sets containing an assortment of sizes so that they can easily be placed together to make any required thickness. Sets are either imperial of metric.

Each slip gauge has a very highly polished finished. This has the strange property that any two surfaces can be “wrung” together and they will stick together. This is done by cleaning the two surfaces. They are put together to form a cross. They are pressed together and then twisted so they are both in line. Any number of slips can be wrung together.

A set of slip gauges can be of different grades of accuracy. But any set will probably be good enough for a model engineer. Their usefulness will be more dependent upon their condition.

467 slip gauges

Fig. Set of slip gauges 467

Any measuring tool is never perfectly the supposed value it is meant to be – there is always some error however small. The problem when adding slip gauges is that the errors all add up. Of course some error are negative whilst others are positive. But to be sure that the overall length is within the acceptable range it means that the individual error of each slip gauge has to be exceedingly small. This means that slip gauges are individually, easily the most accurate standard of length in the workshop.

Slip gauges come in sets made to certain standards. It is likely that the lowest grade ie “workshop” is quite accurate enough for any home workshop.

Slip gauge accessories

Slip gauges are sold in sets. A whole set fits into a single box. however it is possible to get a set of accessories that are designed to be used with a set of slip gauges.

The main item in such a set are holders. These are designed to hold a group of slip gauges that have been wrung together. For convenience holders are provided to hold up to 1inch or 25mm of slip gauges, then from 1 to 2 inches of slip gauges etc. There are also parts which have pieces that project out when held. These are semicircular. When measuring the radius of these together have to be added to the thickness of the slips in the holder. Consequently a set will be either metric or imperial.

6097 set of accessories for slips gauges

6097 set of accessories for slips gauges

fig set of slip gauge accessories

4103 slip gauge holder

4103 slip gauge holder

Fig. slip gauge holder 699

In this case there are two ends on the outside and two slips in the middle. These ends have very accurate semicircular bits that stick out. The radius of the ones in the picture is 2mm. The inside distance is that of the slips. The outside distance is the same plus 4mm.

On a well used set the ability of the slip gauges to wring together can be limited. A holder can be useful in such a case.

3 comments
  1. Narinder said:

    How can I buy slip gauge holder

    • johnf said:

      I buy almost all of my stuff off eBay. If you look on ebay they will most probably be found as “slip gauge accessories”. They not very common. There are none on Ebay at present.
      john f

    • johnf said:

      I have just realised that these are also called combination sets
      john

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s

%d bloggers like this: