Ark Crown anchor systems

~ Free download plans~

Note: - this page is for you to obtain a free set of DXF* & pdf files and have the anchor manufactured yourself.
Note: .DXF* - is a computer program used by the steel fabricators to laser cut the material as per the given specs.

Please select the anchor button pertaining to the size you require.

Note - there are 2 items within each folder, you will only be able to read the pdf as the 'dxf' will not be readable unless you have that program, therefore just download it and pass on to the workshop or get them to download it.

To confirm the length and approx weight of the anchor go to 'specifications'

ARK 400

ARK 500

ARK 550

ARK 600

ARK 630

ARK 660

ARK 700

ARK 730

ARK 760

ARK 820

ARK 950

manufacturing notes

The frame of the anchor may either be cut out from a sheet using the dxf files or, it can be made much cheaper if you use the pdf design to simply fabricate the anchor using round or square metal. If you fabricate it then make sure that the fluke angle corresponds to the design drawing approx 10 degree angle.

If you wish to print off the pdf pages then make sure that when printed, that the fluke or anchor frame is the correct length - example - if you are making the ARK 600, then the image should have printed the frame length at 600 millimeters, and the length of the fluke should be 300 mm as per the figure given on the specs sheet on line.

Anchors may have their stock placed high or low along the shank depending on your requirements.

Anchors 730 cm long and larger are fabricated from 2 sections that are welded together if using the dxf profile cutting method. They may also have 6 rivets as per the ARK 55 kg seen on the main index, this gives added strength and also a better look.

Flukes once cut need to be curved prior to welding, use a press to attain a depth of curve. The depth of curve across the fluke needs to be approximately 12-15% of its length.

Example, the ARK 600 has fluke length of 300 mm, therefore the depth of fluke curve needs to be approximately 36 - 45 mm.

Flukes have a 'cut out' that is a few millimetres wider than the shank, thus the shank can be inserted and the space filled with weld.

The stock crossbar hole needs to be slightly larger than the crossbar so that it can slide through.

The length of the stock crossbar given on the specs sheet does not include the added 'bend' that enables the stock to be dismantled. Some people desire a permanently welded stock especially in the small anchors.

More notes

1 - If you are going to have the frame and fluke cut by a firm using the dxf files then get this done, just tell them to 'check' that the frame and fluke to be cut corresponds (in length) to the anchor you need. This is in case I sent out the wrong size, eg a 500 instead of a 600 or other error.

Get a quote for the items first, as there is a lot of wastage of material that you could have to pay for, - - -unless you tell them to only cut it out when they are doing another 'job' with the same thickness material and can thus 'sit' your piece in between their other items.

The fluke can easily be cut using a template if you wish cutting to be done by a hand held instrument.

2 - Once you have the items cut they need to be 'cleaned' with rough edges ground off. Then have a 'press' indent the curve into the flukes.
3 - Drill the three holes in the frame, the lower one at the base can be 10 mm or so for a 'trip' line attachment. The top one needs be big enough to take the shackle pin for the anchor chain.

The next hole required is the one that will take the stock, and this will need to be done when you have decided what size hole to bore in respect of 'tightness' or flexibility you wish for.

The other + hole centres you see on the drawing may be left blank or drilled out with 10 mm for looks or drilled and riveted also for looks. Where two cut sections are welded together as in the 730 and larger series then they will be rivets on stock shank as well as along the crown section.

4 - Once the holes are finished then you can weld on the flukes. Tack them first to get correct alignment and then weld on the inside and on the reverse side of fluke for strength. Clean up external weld for smooth finish.

5 - In the event that you are not going to use the dxf files and have a laser cut anchor because wish to make a less costly pre-fab one using square or round bar, then simply print off the pdf images and ensure that the printed page design has the correct length to the frame and fluke. You then use this image as a template upon which you shape the frame and weld the fluke angles.

It is up to you to select the material thicknesses. The final weight of the anchor will be more or less than the laser cut one depending on your chosen material.

Happy sailing
More manufacturing info