What is the difference between the grinders?
The Aer models (Aergrind and Aerspeed) are both compact, hold about 25g of beans and will fit inside an Aeropress, but with different 38mm burrsets. The Grinders page gives an easy to understand comparison and outlines their focus.
The Feld47 is a larger 47mm burrset offering more controlled adjustment than the Aer models, which is particularly helpful dialling in espresso. It holds about 47g of beans too, which is apt!
NB on Espresso Whilst the Aergrind can produce a very competent espresso for almost all standard domestic machines, accepted wisdom holds that bigger burrs produce better results for espresso and generally more uniform grinds. If you are especially focused on espresso, for example use a 58mm portafilter machine, have a pro-sumer macine with a HX, a double boiler or E61 grouphead please consider buying the Feld47 to get the best results from your equipment.
The Feld47 is a larger 47mm burrset offering more controlled adjustment than the Aer models, which is particularly helpful dialling in espresso. It holds about 47g of beans too, which is apt!
NB on Espresso Whilst the Aergrind can produce a very competent espresso for almost all standard domestic machines, accepted wisdom holds that bigger burrs produce better results for espresso and generally more uniform grinds. If you are especially focused on espresso, for example use a 58mm portafilter machine, have a pro-sumer macine with a HX, a double boiler or E61 grouphead please consider buying the Feld47 to get the best results from your equipment.
How do I clean my grinder?
A basic brushing every now and then depending on usage should be sufficient - a broad tipped, long handled artist's brush or narrow toothbrush would be suitable. Occasionally wiping with a barely damp cloth is all that is required for the outer body of the grinder. A quick grind of a few grams of uncooked rice can be used to clean the burrs if they have not been used for a while. Please store in a dry place in general but particularly if you do not intend to use the grinder on a daily basis. Full cleaning instructions can be found here.
When do you restock?
We aim to restock as often as possible. Add your email to our mailing list on the home page and you'll be notified as soon as we restock any of our grinders or brew kit. You'll also be the first to know about new products or grinder packages too.
What grind settings do you recommend?
In Scotland you never water another person's whisky, and at Knock we never dictate someone's grind settings!
But seriously, the bean varietal, roast style, roast age, brew method and even water type all play such a huge part that its impossible for us to recommend specifics. Your best bet is to test a small grind of a few grams at the appropriate setting from above and see how that compares to your usual grind, then adjust accordingly.
Have a look at our grind settings and instructions page to help you get started.
But seriously, the bean varietal, roast style, roast age, brew method and even water type all play such a huge part that its impossible for us to recommend specifics. Your best bet is to test a small grind of a few grams at the appropriate setting from above and see how that compares to your usual grind, then adjust accordingly.
Have a look at our grind settings and instructions page to help you get started.
Are there any instructions?
Yes! Click here to read at our Aergrind set up instructions and grind settings guide.
What is your returns policy and warranty?
We offer a 12 month back-to-base warranty on all our products. Go to our Terms & Conditions page for more information on shipping and returns.
Why is my grinder not 'zero-ed'
Ah but it is!
We set the zero point (and thereby the dial numbering) for all Aergrinds where the burrs are "flush" with each other. At this point no grinds can pass through the burrs and whilst it may be possible to rotate the inner burr it is in constant contact with the outer. At this point the crank arm indicator will show between 12 and 1 on the dial, depending on how close you have it to flush.
From here it is important to understand that each burr pairing is genuinely unique and as such it is possible to continue winding and "overlock" the set - this is where the inner burr passes up inside the outer burr to some degree.
We don't recommend winding the burr in any further than flush as there is a potential to force the burrs into a full lock, where the burrs bind into each other. This can damage the burrs and cause problems with the mechanism. Nothing is to be gained by forcing the burrs together - its not dissimilar to backing a car physically into the garage door to make sure you really have reversed as far as possible before setting off!
We set the zero point (and thereby the dial numbering) for all Aergrinds where the burrs are "flush" with each other. At this point no grinds can pass through the burrs and whilst it may be possible to rotate the inner burr it is in constant contact with the outer. At this point the crank arm indicator will show between 12 and 1 on the dial, depending on how close you have it to flush.
From here it is important to understand that each burr pairing is genuinely unique and as such it is possible to continue winding and "overlock" the set - this is where the inner burr passes up inside the outer burr to some degree.
We don't recommend winding the burr in any further than flush as there is a potential to force the burrs into a full lock, where the burrs bind into each other. This can damage the burrs and cause problems with the mechanism. Nothing is to be gained by forcing the burrs together - its not dissimilar to backing a car physically into the garage door to make sure you really have reversed as far as possible before setting off!
Why is my grind setting slipping when I grind?
To achieve a true infinite adjustment we don't use the limited adjustibility of a locking or click stop system - instead we use a friction system, where nitrile gaskets / o-rings provide the necessary stopping power. This infinite adjustment capability is what gives you the ability to really dial in your grind to achieve the best results in the cup.
Your grinder comes with a spare set of o-rings which you should keep safe for if or when your grinder setting start to move. At this point you will simply need to follow the instructions for replacing the shaft o-ring.
NB Aergrind mileage - You may find that you if you are an "Aergrind power user" (and more so if you favour very light roasts) that your o-ring needs replacing before the first year of use is complete. This is perfectly normal and just means you have been an above average enthusiastic grinder of quality craft roasted coffee beans instead of soft, volume run supermarket roasts.
The old adage YMMV applies here: we don't regard this as a a flaw in your grinder or necessarily a reason to return the item - it's simply a maintenance requirement of your mileage.
However, if you get through the replacement set of o-rings in under 6 months you should contact us and we can discuss setting getting you some more replacement o-rings and or trading up to a heavier duty model.
Your grinder comes with a spare set of o-rings which you should keep safe for if or when your grinder setting start to move. At this point you will simply need to follow the instructions for replacing the shaft o-ring.
NB Aergrind mileage - You may find that you if you are an "Aergrind power user" (and more so if you favour very light roasts) that your o-ring needs replacing before the first year of use is complete. This is perfectly normal and just means you have been an above average enthusiastic grinder of quality craft roasted coffee beans instead of soft, volume run supermarket roasts.
The old adage YMMV applies here: we don't regard this as a a flaw in your grinder or necessarily a reason to return the item - it's simply a maintenance requirement of your mileage.
However, if you get through the replacement set of o-rings in under 6 months you should contact us and we can discuss setting getting you some more replacement o-rings and or trading up to a heavier duty model.
Can I buy spare parts for my grinder?
Yes, we sell spare o-rings, rubber bands, crank arms and lids for the Aerspeed, Aergrind and Feld 47 Travel grinders. Go to the store page and you'll find spares listed there! If you have an older model Feldgrind, Feldwood, or the original Hausgrind please get in contact and we will help as best we can.