BLH Drafting Services | Engineering service

BLH Drafting Services

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25.01.2022 Diamond shaft (or self reversing screw) in action. The rotation of the main shaft stays constant and the pawl runs in the shaft groove and changes from traveling left to right then right to left at the end of the groove.

24.01.2022 It's always a pleasure working with SLTEC Fertilizers on their projects. Latest one was a series of custom trailers with cone bottom tanks. Part of the project was the design of a mold for the tanks. This project included the original design & manufacturing drawings for the tank & rework of a previous designers work for the trailers to be made. There was an extensive amount of sheetmetal/plate parts in all 4 designs and BLH used their arsenal of custom CAD tools to effortless...ly export these ready for laser cutting c/w PF drawings & spreadsheets of parts v material/grade v quantities. Check out the pics of the trailers & mold.

24.01.2022 Quick little project for a work mate. He wanted new feet for an LCD TV with a 45 degree rotation in the mount. Modelled the RH version and printed it then mirrored the model for the LH version. A bonus is the pleasing geometry of the support structure

23.01.2022 A new workhorse to add to the office stable

23.01.2022 Here are some photos of the cone sections fitted to the clients chicken shed. Soon the lids will be added complete with the electric actuators to open them.

20.01.2022 Im currently designing and manufacturing a Diamond Screw (or self reversing screw) for a prototype design so needed to order a new piece of kit, a 4 axis hobby router. 4th axis is rotational which will allow me to fit a shaft between centres and machine the complicated screw path. Below are pics of the unit and the design of the diamond shaft (so far) and a video link of the screw action. This mechanism is common in baitcaster fishing rods and on winches that neatly lay the rope/cable on the spool. https://youtu.be/G08XrZiELYQ

19.01.2022 Trying out a new addition to the business toolbox. A fabulous 2nd hand A0 size plotter. Thats 841 x 1189 mm in full colour! If you have a need for large prints, drop me a message.

18.01.2022 Its always a pleasure working with SLTEC Fertilizers on their projects. Latest one was a series of custom trailers with cone bottom tanks. Part of the project was the design of a mold for the tanks. This project included the original design & manufacturing drawings for the tank & rework of a previous designers work for the trailers to be made. There was an extensive amount of sheetmetal/plate parts in all 4 designs and BLH used their arsenal of custom CAD tools to effortless...ly export these ready for laser cutting c/w PF drawings & spreadsheets of parts v material/grade v quantities. Check out the pics of the trailers & mold.

18.01.2022 Photos of the first 6 of 16 completed bolt on access panels to suit GSI BFT 12 silos. These are to be cut and drilled to fit inside the cone panels. Construction is standard steels in a mix of galvanised coating and zinc rich primer over welds. Design incorporates features that make these easily converted to suit gas sealed silo requirements with the addition of silicon based sealant in 1 location and a rubber strip around the flat of the access hole ring. The manufacturer u...sed Bendigo suppliers for the steel and laser cut parts. These units look fantastic and will do the job required by the client. Client = AGCO Australia. Designer = BLH Drafting Services Manufacturer = McCullochs Hydraulics / Manufacturing

18.01.2022 With a 300*300 bed and 400 high capability this 3d printer has serious prototyping possibilities. Ive finished my tests on toys and a vase and will now begin some serious work.

14.01.2022 My latest project is the preliminary design of 2 large parts for roto-molding. Customer was very happy with these. Project included mechanical features and linear actuators. They have now asked me to design & complete the mold designs for the initial parts to be molded and inspected for suitability & possible changes. Have done a few roto-molded parts and the molds before, but this one is a challenge as its not a simple water tank or similar type design.

14.01.2022 Photos of the first 6 of 16 completed bolt on access panels to suit GSI BFT 12' silos. These are to be cut and drilled to fit inside the cone panels. Construction is standard steels in a mix of galvanised coating and zinc rich primer over welds. Design incorporates features that make these easily converted to suit gas sealed silo requirements with the addition of silicon based sealant in 1 location and a rubber strip around the flat of the access hole ring. The manufacturer u...sed Bendigo suppliers for the steel and laser cut parts. These units look fantastic and will do the job required by the client. Client = AGCO Australia. Designer = BLH Drafting Services Manufacturer = McCullochs Hydraulics / Manufacturing

14.01.2022 A roto-molded plastic fan cowl that BLH Drafting designed both the finished part and the mold for.

13.01.2022 Just completed a flawless 24 hr 49 minute print on the CR-10S. Item is a prototype drill rig part which will be used to produce a mold for sand casting in cast steel. Item is 200 mm tall X 160 mm wide X 150 mm deep. Printed upside down to minimise overhangs. There is a 50 mm X 20 mm solid on the bed to adhere it to the glass. Really impressed with the outcome.

12.01.2022 Trying out a new addition to the business toolbox. A fabulous 2nd hand A0 size plotter. That's 841 x 1189 mm in full colour! If you have a need for large prints, drop me a message.

09.01.2022 Continuing on from the previous update, I had a set of 3D printer parts made of the finished project. The linear actuator (electric ram) used to operate the lid movement would have come out too small so it has been skipped over. The 3D printing was done to verify the project design with the use of the scale parts (scaled down 10:1). Next step is to screw them together and present to the customer for validation of the project. Its been 5 months since my last post and in this time the customer has approved the manufacture of the steel mold assemblies for the roto-molding. This work was completed by B. Keogh & Sons manufacturing (www.augers.com.au) and the finished molds have been sent to Waterstore (www.waterstore.com.au) for the roto-molding. The first run of parts is expected in the next few weeks.

09.01.2022 The photos are of the finished full size roto-molded cone part of this project (the white part in the CAD model and the drawing). It came out of the mold perfectly and the customer has bolted a fan to it and run it successfully. The lid (red part in model and drawing) was not quite so perfect. Some alterations are required to allow a difficult section of the molded part to be released from the mold. These photos will be published when the part has been molded.

06.01.2022 Just finished a plan for a friend for council application to erect a new shed. Sometimes the simple stuff is the most pleasing.

04.01.2022 From concept in CAD to 3D printed parts to assembly and proving the concept. Mechanism is a level wind or lay wind system. Rotational movement of the shaft gives linear left/right movement of the block. At the ends of the shaft flutes the mechanism changes direction and linear movement is continued in the opposite direction. Shaft can be turned either CW or CCW and the linear movement is still present.

03.01.2022 Been printing this 30:1 rig model over the last couple of weeks. Not bad for my first effort. Printed in PLA on a #cr10-s. Truck is 380 mm long.

03.01.2022 From email to 3D model to 2D drawings and finishing with the manufactured goods. It was a pleasure working with the team at Agco Australia to design and deliver a pair of customised hoppers for a new brewery in Melbourne. The large hopper is the storage vessel for malt barley. Key points are it is blow filled and in close proximity to a large industrial restaurant waste bin so a fully sealed hopper was designed with fittings for air transfer from another room when dischargin...g from the hopper. The small hopper is a bag tipping station and batch hopper that is filled from the large hopper via a GSI flexible auger and roller mill. The batch hopper is sitting atop loadcells for accurate batching of products. A second flexible auger will then deliver the milled product to the brewery approximately 35 metres away. The location for this pairing is adjacent to the Melbourne Star so an engineering analysis was run on the structure and a 3rd party did the same for the pre-stressed concrete around the installation. It was a very tight squeeze getting the large hopper in as it was made with 50mm clearance from the overhead services. Getting this hopper into location was made easy by designing the hopper with low level forklift pockets. Feedback from the manufacturer/installer is shown below, 100% unedited :- Just received this pic from the customer. Thought you might want to see it. FYI. The fabricator said that the drawings were spot on. Some of the best he has received as every piece went together perfectly. Well done.

02.01.2022 Today I updated a tired website to a new layout with a bit of bling. Check it out! www.blhdrafting.com.au

01.01.2022 A colleague made a request on a Google+ site I visit for Voronoi Pattern to be applied to a part face. Used Autodesk Fusion for this with an add-in.Output is pretty cool! He intends on applying this pattern to a 1600*500 aluminium sheet and then laser cutting it. Done as a pro bono job.

01.01.2022 This is my biggest project so far. I was contacted by a colleague I knew from my previous day job employer who needed an aeration duct designed using details from various previous designs. This is what we came up with over several design iterations with my client, his clients and the engineer I contracted for design validation checks. An interesting part of this design is that the duct is impacted by negative pressure, so the sheer weight of the 30 tonne duct also had a sucki...ng action working on the internals of the duct, basically trying to drag it down into the mine. The duct sits on top of a 5.5 metre diameter shaft c/w a collar that I had to interface with. The 3 square outlets connect to separate runs of cowls and silencers (which I also designed) and finally to the fans. The duct is made in 4 separate pieces for transport and assembly on site. Part of my design included a basic lifting plan that was later qualified by the same engineer I contracted. Materials are basic GR250 steel plates and C300/C350 flats & angle irons. The square domes on the rear pic are explosion vents that in this case are also for negative pressure. If either an over or under pressure event occurs, these vents tear along predefined lines to relieve the event. I quite enjoyed this design project as it included different modelling techniques, iterations and all of the drawings & DXF files for laser cutting the plates.