Load frame

Version 28.1 by fwilde on 2023/10/12 12:28

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Overview
Actuator
Load cells
Load frame assembly
- Large load cell installation
- Small load cell installation
Tubes
Sample mounting
Reference

Overview

Forces up to 1 kN (both pushing or pulling)
Load cells 20N, 50N, 100N, 200N, 500N and 1000N available
Fully integrated into control and logging system

Actuator

PIMicos MA-35
max. load (in travel direction)	1000N
Travel range	? mm
max. speed	5000 µm/s
Step width	1/20 µm
fine pitch thread	M(8 x 1.0) x 45 ???

Load cells

Two types of load cells are available with different diameters with the following force range

large	small

20 N	-
50 N	-
100 N	-
200 N	200 N
-	500 N
-	1000 N
thread: M8 (max len 15 mm)	thread: M4 (max len 6 mm)

Load frame assembly

Considering different applications (high forces, low forces, pushing or pulling) the assembly follows slightly different paths. Generally, assembling the load frame can be broken down into these steps:

Install a base plate on the rotation stage (use spacers, decide which plate to use)
Mount load cell on base plate with desired pin or clamp (depending on push or pull experiments)
Mount sample tube (choose the tube type according to your application)
Mount pusher

Large load cell installation

For the large load cell a specific base plate has to be used


Base plate with load cell	Load cell with pin (M5 gaused for pulling

Mount bridge and guide - there are two different types of tube, so assembly depends on your choice of tube:

Tube with thread ring


Bridge	Brigde and pin guide	Tube with thread ring

Tube with internal thread


Bridge	Bridge and pin guide	Tube with internal thread

Load cell pin for pulling


Total length	56 mm
Thread at load cell	M8 x 6
Thread top part	M5 x 14
Pin guide in brigde diameter	6 mm

Small load cell installation

For the small load cell a specific base plate has to be used


Base plate with load cell	Load cell with pin used for pulling

Mount pin guide and bridge - there are two different types of tube, so assembly depends on your choice of tube:

Tube with thread ring


Pin guide, no bridge necessary Distance top load cell - top bridge surface: 23.5mm (+ 6 mm thread of load cell) For own	Tube with thread ring

Tube with internal thread


Pin guide	Bridge	Optionally: insert push pin	Tube with internal thread

Load cell pin for pulling


Total length	80 mm
Thread at load cell	M4 x 4
Thread top part	M5 x 35
Pin guide in brigde diameter	6 mm

Tubes

There are different tubes available at the beamline. Should the tube be unsuitable for your sample, a new tube can be manufactured. Please contact the beamline staff well in advance of your beamtime.

Different Tubes with lengths of 80 mm, 140 mm and 160 mm

Sample mounting

Pins and clamps

Depending on your application, sample installation may vary. There are a selection of pushing pins and pulling clamps available at the beamline which will be presented in this section. Nevertheless these pins or clamps may be unsuitable for your sample. In this case a suitable pin or clamp can be manufactured. Please contact the beamline staff well in advance of your beamtime.

Pushing		Pulling
Bottom push pin		Bottom pull thread
Top push pin		Principle of pull installation
Top push pin		Pull clamps for low forces

Reference

Moosmann et al. "A load frame for in situ tomography at PETRA III", Proc. SPIE 11113, Developments in X-Ray Tomography XII, 1111318 (2019); https://doi.org/10.1117/12.2530445