Categories
Tools

Website Speed Tests

Pingdom Website Speed Test

simply enter a url to test the load time of that page, analyze it and find bottlenecks

https://tools.pingdom.com

GTmetrix

simply enter a url to analyze your site’s speed and make it faster. GTmetrix gives you insight on how well your site loads and provides recommendations on how to optimize it.

https://gtmetrix.com

Categories
3D Printing Cloud Projects

3D Printing a Replacement Door Handle

How I created a new handle for my fridge/freezer by 3D printing a new one.

This handle is used to open the freezer door in a combined fridge/freezer. The current handle has been hanging on by a thread for a while and been through 2 repairs previously, but now it’s no longer viable.

3D Printing - the broken part

At first I thought it would be easy enough to get a replacement handle, so contacted the manufacturer of the fridge/freezer.

Good Morning,

Thank you for your email.

The part you require is discontinued without replacement.

Sorry for any inconvenience caused.

“For help with your home appliance trust ******** Customer Service. Service you can depend on.”

Inconvenient? Yes it’s a bit difficult to open the freezer when it doesn’t have a handle – but at least I can, just about, open the fridge without the handle.

DSCN3833

Seems a shame, though, to have to replace the whole fridge freezer for want of a handle.

It is possible to locate an equivalent handle (genuine part) but, unfortunately, only in white.

whitehandle

It looks like I need to make my own handle. Is it possible to use 3D Printing to print a new handle ?

Design

First thing to do is to create a 3D model of the handle.

I have used a number of different 3D CAD Modelling programs in the past but for this job I’ll be using Onshape a full-cloud, online 3D CAD system used from a web-browser.

It is straightforward to create a fairly close representation of the required handle and I completed work on the design/model in about an hour. I didn’t come across any particular difficulties with the modelling or any problems using Onshape during this process.

modelhandle

I also did a couple of quick renders using OneRender https://www.onerender.com , an online rendering application which works with Onshape.

11430-rendered-60447_gi

11430-rendered-60449_gi

Looks OK to me.

3D Printing

In order to generate a file suitable for 3D printing, simply export the model from Onshape in STL format. Then either use your own printer or, as in my case, upload the STL file to your favourite online 3D Printing service.

I haven’t used an online service in the past so I’m going to try i.materialise

It’s simple to register and upload your model.

Here it is

order

Not sure what the best material is to use for this application, but thought I’d try Polyamide which appears to have similar strength properties to ABS (but perhaps a bit more flexible). The manufacturing process for this material uses Laser Sintering.

Laser sintering is used to build your design with this material. The models are printed layer by layer by a laser that draws thin lines in the powder, which melts and bonds it together in order to form a thin layer of the model. After a layer is printed, a new layer of fresh powder is spread over the surface by a roller. The printer has a print chamber that is heated to just below the melting point of the powder; the laser beam adds the extra energy to melt the powder, forming a solid model. After a print job is finished, the result is a big block of heated powder with the printed models contained inside.

Also chose a polished and dyed black finish.

iMaterialise also provides an Analysis option which checks whether your model can be printed and highlights any potential problem areas.

Looks good to go

analysis

so submitted the order.

It’s probably taken less time creating the part and sending it off for printing than trying to find the exact equivalent original (genuine) part.

If my 3D printed model does not prove to be “fit for purpose”, at the very least it should establish whether the 3D model (design) is good enough.

The only problem now is having to wait 2 weeks before I can get my hands on the new 3D printed handle ….

…. 2 weeks later

I received the following parcel today, what could it be ?

DSCN3835

Nicely protected and here it is – looks promising.

DSCN3837

The new handle can be compared to the original. The actual modelling is a good match to the original design, but of course, the surface finish of the new one doesn’t (exactly) match the gloss finish of the original.

DSCN3845

5 minutes later it is fitted in place – and fits perfectly, of course. I would make a couple of minor (design) modifications if I was to do it again. The countersinks for the the screws are on the wrong side ! (my fault) but otherwise it seems OK. Also, I would do a stress analysis of the design before having it printed. (various simulation packages are available to use with Onshape via their App Store).

DSCN3850

Aesthetically speaking, it looks good and actually the matt finish is growing on me. (The wife hasn’t seen it yet though). I can always paint it with acrylic, or something similar, to get a glossier finish.

DSCN3847

Time will tell how it stands up to use. I’ve noted a bit of flexing of the handle when the door is opened and perhaps it should be a little bit more rigid/stronger (different material?) although I did notice some flexing in the original handle too.

All in all a successful exercise so far – the handle is about to enter Beta Testing.

While I can understand why manufacturers may be reluctant to make technical information (design details) available for their spare parts, is there any reason why they couldn’t offer a 3D printing service for the parts that they discontinue ? Even if they were to outsource the production to a 3rd party it seems to me like a valuable additional revenue stream and they would really be able to claim that they were offering a Service you can depend on

Categories
Tools

ACE embeddable code editor

Ace is a code editor written in JavaScript which can be embedded in any web-page/JavaScript application. It is a community project with the source code hosted on GitHub and released under the BSD license.

Features include:

  • Syntax highlighting
  • Over 20 themes
  • Automatic indenting
  • Search and replace with regular expressions
  • Highlight matching parentheses
  • Line wrapping
  • Code folding
  • Cut, copy, and paste functionality
  • etc.

All the details are available at

https://ace.c9.io/

Categories
Cloud Software Techniques

Decorative Panels using Variables in Onshape

Recently, I noticed some decorative wood panelling and thought it would be an interesting exercise to create them, or something similar, as a 3D model using Onshape. The technique I’m going to use could be equally applied when creating fretwork or trellis.

DecorativeWoodPanel

I’ll take advantage of the symmetry in the design to simplify the geometry that I need to create and use the recently introduced “Variables” feature in Onshape as parameters to control the overall size and allow different designs to be easily created.

My design consists primarily of intersecting circular arcs which will be extruded to create a flat panel. A basic shape will be created and use the “Linear Pattern” feature to create the panel. Due to the symmetry in the basic shape, I only need to create a quarter which can then be mirrored to produce the basic shape.

Use the Variable command from the toolbar

VariableCommand

to create variables for:

Diameter – the overall size of the basic shape, initially set to 100mm.

VariableCreation

and

Thickness – the thickness of lines used in the shape, set to 2mm.

VariableFeatures

Note:
Variables are created as features and referenced by #name, in this case #Diameter and #Thickness. The value entered for the variable can use expressions, such as #Radius = #Diameter/2 but it remains unclear how extensive these can be (experiment for yourself).

Create a sketch, I’ve used the “Top” plane and will use the top right quadrant (origin at bottom left) to define the geometry.

Create horizontal and vertical construction lines and dimension their distance from the origin specifying the variable #Dimension as the value for the dimension. The dimension will be displayed showing the value of the variable.

Dimension

Note:
Dimensions defined using variables will be displayed showing the result of the expression. Click on the dimension to view/modify the value of the variable.

Proceed to create the remain geometry. Adding dimensions as necessary to ensure that the sketch is fully constrained.

dimension2

Dimension3

Dimension4

Extrude the sketch to create a solid

Quarter

Mirror the part to create half the shape.

half

Mirror the part to create the basic shape ready for patterning

Full

For the panel create 2 additional variables

#Horizontal – the number of basic shapes to pattern in the “x”-direction set to 2.

#Vertical – the number of basics shape to pattern in the “y”-direction set to 2.

and use the Linear Pattern tool to create the final pattern.

Vertical

Change the panel by sinply modifying the variables to create different results

FinalPanel

Modify the sketch to create more complex patterns

Sample2Outline

Sample2

Here’s the finished Panel matching (or at least close to) the original image

Complete

Summary

Variables are a useful addition to the functionality available in Onshape and could have been implemented to form the basis for a future fully featured macro programming language which may be made available for users. They can be used to simplify the process for non CAD literate users when modifications are required to the model.

Categories
Hardware

Apple Pencil

pencil1

The Apple Pencil is an additional accessory which can (only) be used in conjunction with the forthcoming iPad Pro (scheduled to be available in November 2015).

It’s something I’ve been waiting for since the first iPad was released way back in 2010 and should provide that extra bit of precision in addition to the versatility of multi-touch.

pencil2

There are certain minimum requirements in a stylus which all seem to have been covered in the design of this “electronic pencil”

  • Latency – how fast the system responds when a line is being drawn
  • Pressure sensitivity – pressing harder to produce thicker lines

An additional feature is the ability to produce shading effects by varying the angle (tilting) the pencil tip when drawing.

https://youtu.be/iicnVez5U7M

(link: https://youtu.be/iicnVez5U7M)

The pencil has an in-built battery which should last for 12 hours following a full charge. In an emergency, 15 seconds of charge will provide 30 minutes of use. It is charged from the iPad Pro using a lightning connector.

Read more at http://www.apple.com/uk/apple-pencil/

If being a little churlish, I would have liked the top of the pen being available to be used as an “eraser” but hey, well done Apple, this new stylus looks to be a very useful addition especially if you work with a lot of drawings or CAD applications.