Author - George

EMV-25CNC kit headplate

EMV-25VBB CNC Kit – The story

Over in the shop we are running a preorder for the CNC conversion kit. Here we would like to give you a bit of background on how it all came about and our design intent.

From day 1 of ordering the EMV-25VBB milling machines, the CNC conversion kit was always going to be an option we would offer. As the development reaches commercialisation and release, let us give you a bit of background on how we designed and thought the project through.

The first conversion our team did involved a Chester Machine tools Super lux. At the time, we were short of cash and also wanted to get the machine running asap. This was not a good combination as corners were cut, money was skimped with the end result…well much to be desired. Thanks to that machine one of us learnt to hand scrape for flatness and alignment as well and owns more metrology tools than we would need, a Biax powerscraper and a granite table.

The following learning outcomes have stayed with us as we designed the conversion kit for the EMV-25VBB:

Servos are so much better but Steppers can be good

Granted there is a cost to servos and there is also a learning curve regarding PID position control and parameter tuning. Thankfully Clearpath servos are here to save the day! Plenty of YouTube videos to prove why, including John Sanders’ special projects! Thankfully for those with a limited budget, the option of using steppers is not eliminated due to the servo motors we will ultimately inlcude are also Nema 23 frame sizes. The added bonus of the servo is that you can back drive it much easier than a stepper. Our protoype kit sports steppers, because that is what we had at the time

Don’t touch the castings!

Invariably the castings used on the machines we are aiming this kit to are not aged or stress relieved. In some cases they are not even ground well enough. On our Chester we found that even drilling lubrication points was a bad idea as the saddles would move killing the accuracy we hand scraped into them. So great effort has been expended to get a custom made ballnut and ballscrew mount to allow fitment of the X-axis screw. In fact we even use the same screws from the factory in most case. No more hunting around for a mate with a Bridgeport!

Backlash sucks!

Yes you read that right, no too ways about it. Yeah you can use the CNC controllers backlash compensation function but why not just eliminate it from the getgo? We came to this conclusion about 3 months after we put the first machine together. Kept chasing repeatability, squared off circles and steps in all directions. So ditch the silly ideas of springs between the nuts, shims etc and go with quality precision manufactured ballscrews and bearings throughout.

Hence our kit is based on C5 accuracy ground and preloaded ballscrews. They are so good they can be backdriven!

Wish I had kept the handles

Why code a a hole drilling program if you only want to do a quick job? Not going to eliminate the quill too right? So yeah, jogging with a keyboard is impractical and for the one quick hole you want to make using that drill you cannot really be bothered to touch off…Lets keep the handles on. Oh but wait, what happens when the handles are spinning with the motors? Best make them the safety kind.

Material choice

In order to eliminate backlash and lost motion, we have made the ballnut mounts out of steel. As you may already know the coupling between the casting and the nut occurs through a boss and it is held in place with a single screw. Using steel we know that the parts will last a long time with no loss of rigidity.

What machines will this fit on?

The kit came about with some help from Aaron Powter of Youtube fame. He designed his kits to fit the Titan machine tools, available in Australia. His kit fits the AMAT25LV, the Optimum BF20, HBM BF25 and other machines too. The biggest difference between the EMV-25VBB and the other mills is the end of the table. Ours takes a small flange that does not cover the ends of the T-Slot area, while the others have a larger plate. To keep all of your covered we have designed both variants.

How do we get this kit?

Getting the numbers up is critical in being able to make this viable. Unlike the other kits available, we have put great effort to ensure it is as plug and play as possible, this has built in the complexity of needing special ballnuts and holders. So, we are asking that our customers head on over to the shop area and preorder their kits. This commitment keeps you keen and us on track. Think of it like crowdfunding.

Head on over now to see the rest of the photos!

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Award winning budget printers from CraftUnique! Craftbot 2 and Craftbot 2XL

EmvioENG now working with CraftUnique

Following on the theme of top printers, we are excited to be working with Craftunique from Hungary! EmvioENG is an official UK partner, importing, distributing, selling and servicing the Craftbot range of machine!
The Craftbot printer range has, this year, won 2 awards issued by 3DHubs.com

 

We met the CraftUnique team at TCT in 2016 and have since started importing the Craftbots to the  UK. Of particular interest to us has been the Craftbot 2 and Craftbot XL as they are now fully updated with the latest nice-to-haves anyone would like.

Both machines have a very solid build. Steel chassis, Linear rails on the XL and all metal construction throughout. Oh and whats more, you can also specify the colour of the machine you would like! We have the blue one but the anthracite colours are really good too.

Get in touch if you would like to become a reseller

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Extruder mechanism upgraded: Bondtech Dual Drive

Since early July, we have a had a very successful working relationship with Bondtech, the Swedish company producing Dual Drive extruders. The Bondtech extruders without question have brought a step change in reliability of extrusion. Main characteristic of course is the driving mechanism used: Twin counter rotating hobbed wheels.

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EMV-MC faceplate

Teaser alert! What we have been secretly organising

You know the counter in the machine tools page. Well it is counting down to the 19th of August 2016, the day we unveil our grandest product to date. the unveiling will be done in the Thornbury model engineering exhibition so why not check us out at stand 134.

You can find more about the BSMEE on the official exhibition webpage

 

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We are distributors of Bondtech products to the UK and IRE

The big news of the week is that we are now the UK and Ireland exclusive distributors to all the Bondtech products.

Bondtech extruders have understandably revolutionised the reliability and speed of printing using filaments.

The team have a series of mounts to allow adapting the parts to any prosumer quality printer that are freely available from us or from Bondtech directly.

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BCN3D Sigma: Cleaning the filament feeder

About 7kg of filament later and lots delightful prints with the BCN3D Sigma we noticed  that ground filament and dust had accumulated on the extruder feeder gear. Perfect opportunity to clean the filament feeder by taking it apart, checking out how it is engineered and learn a bit more about the Sigma!

Here is how we did it step by step.

Step 1. Unscrew the socket cap screw shown below to release the bottom Bowden tube. the printed part holds against a nut which is screwed on the tube. Simple and effective!

BCN3D Sigma feeder, lower bowden tube fixing
BCN3D Sigma showing the bottom bowden filament guiding tube fixing system, nut and printed part

Step 2. Unscrew the 2 nuts holding the stepper motor board shield and unplug the stepper motor. Try not to lose the tubular spacers! Take them out and store them safely.

Unscrewing the stepper motor driver board shield on the BCN3D Sigma
BCN3D Sigma extruder motor stepper motor driver board exposed

Step 3. Remove the top Bowden tube from the feeder by pushing down on the grey ring and pulling the tube out . Then unscrew the nuts holding the stepper motor bracket on the frame. Remove the feeder from the Sigma.

Removing the top bowden tube of the BCN3D Sigma
Removing the extruder feeder from the BCN3D Sigmas frame

Step 4. Now start taking the feeder apart. Unscrew the large grub screw and remove the tension adjustment spring. Then unscrew the 3 long hex screws which hold all the parts on the stepper motor.

Unscrewing the tension screw of the BCN3D Sigma extruder feeder
Removed screws from the extruder feeder of the BCN3D Sigma

Step 8.  Dissemble the feeder and clean all the parts from filament grindings and dust with a small brush. A toothbrush will also do!

The parts of the extruder feeder of the BCN3D Sigma 3D printer
Brushing off the dust from the feeder gear on the BCN3D Sigma

Step 9. Reassembly time! Start  by placing the aluminium bracket with the bent part facing towards the cables. Then the plastic spacer and pinch levers as shown below.

Reassembly of the extruder feeder of the BCN3D Sigma
Reassembly of the extruder feeder of the BCN3D Sigma
Reassembly of the extruder feeder of the BCN3D Sigma
Reassembly of the extruder feeder of the BCN3D Sigma

Step 10. Insert the tension spring through the hole of the top lever and screw in the large grub screw to compress it. In my experience 1 turn after the top of the screw is flush with the lever surface give a good starting point in terms of spring tension.

Reassembly of the extruder feeder of the BCN3D Sigma tension spring
Clean_17

Step 11. Take the feeder back to the Sigma and fix the bottom Bowden tube on before mounting on the frame, makes life easier! Then slide the feeder on the studs of the frame and fix it in place with the 2 nuts. Connect the motor back to the driver. IMPORTANT! Don’t forge the spacers!!! 2 on each side of the board.

Clean_20
Clean_21_2

Step 13. Fix the aluminium stepper driver shield back on and insert the top Bowden tube. Done! grabs beer…

Clean_22

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CAD mock up of R8 Spindle and QTC tooling

Drawbar tension for R8 and MT3 collets to work safely with QTC tooling?

We have been asked on a number of occasions, and seen in a number of forums, the question of “How much tension should I put on my drawbar when I use  Emvio (or Tormach) repeatable Z tooling?” This question is a very common for those looking to make a pneumatically actuated drawbar using Belville washers. So what do you need to know about Drawbar Tension?

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BCN3D Sigma 3D Printer

We take it apart so you don’t have to: BCN3D Sigma

The only way to be sure that any machine is really well designed is to take to bits and have a look inside it! That’s what we did at Emvio Engineering with our BCN3D Technologies Sigma! Oh why not check it out in our shop too
Under the beautiful bottom cover of the Sigma we found the electronics and were impressed with the cable management and over all neat setting.

Preparation

Then it was time to pull the Z axis out for a closer look… The 2 vertical rods are held in place with welded studs on the frame which made the task very easy. The print bed support made of bent aluminium is very stiff and those side cuts look awesome. The black heat bed sits on a cork pad and both are suspended by 3 springs in triangular arrangement.

I did wonder what was behind the slick looking print heads. Started by removing any screw stood in my way! The nozzle was out and in less than 10 seconds in under a minute the linear slide was revealed. It runs unworldly smooth with no play at all!

Here is the official maintenance video from BNC3D Techonologies showing how easy it is to remove and replace the hotend

To Be Continued..
in the next episode we will take apart the X, Y motion system and extruders!

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Emvio Engineering is now a reseller of all BCN3D products

It is with great pride that we bring to the UK market the products designed  BCN3D Technologies.

BCN3D Technologies started off as a project of Fundació CIM, which has more than 20 years of experience in Rapid Prototyping and knowledge transfer. The results have been impressive and that is why when we first came across the company, we were keen to collaborate with them

We will be keeping stock of as many of their products as our limited storage space allows but will be giving priority to the Sigma. As you may have seen in our earlier post, we were giddy with anticipation when the Sigma was released. In no time you will be able to browse our shop for all four of BCN3D printers:

BCN3D Sigma 3D printer

The BCN3D Sigma – The flag ship model that received the best quality award on 3Dhubs page for April

The BCN3D Lux – A SLA machine working with photoreactive resin allowing for fantastically fine layers and printing speed

BCN3D+ kit

The BCN3D Plus – A Prusa clone kit aimed at those wanting to build their own printers

BCN3DDR Delta Printer

The BCN3DR – Another kit but this time for a Delta printer

BCN3D Ignis laser cutter

The BCN3D Ignis – a premium 100W CO2 laser cutter with honeycomb bed and a 900×650 working area

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Emvio Engineering Nema 17 stepper motor damper installed

Damping the sound of stepper motors on 3D printers

Most of us that tinker with 3D printing have wondered how to reduce the groan and squeal of the stepper motors driving us nuts. Especially when long prints are involved!

For a while now we have been using and selling our own vibration dampers that place a rubber buffer between the stepper and the printers frame. The rubber is thin and stiff enough to maintain accuracy of the stepper motor while reducing the vibrations being transmitted to the body of the printer.

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Dear Customers, please note that we are experiencing some delays in receiving 1.75mm filaments. We are working with our suppliers to resolve this. Thank you for your patience. Dismiss