rokuro wo tukau.

を marks the direct object of the verb. In other words, it shows what is being used.

So in ろくろを使う:

• ろくろ = the thing being used
• 使う = to use
• を = marks ろくろ as the object

This is a very common pattern in Japanese:

• スマホを使う = use a smartphone
• 道具を使う = use a tool
• ろくろを使う = use a pottery wheel / lathe / etc. depending on context

Japanese sentences usually put the verb at the end.

A basic sentence pattern is:

object + を + verb

So:

• ろくろ = object
• を = object marker
• 使う = verb

That makes ろくろを使う a very normal Japanese word order.

使う is the dictionary form (plain form) of the verb.

In Japanese, this form can mean different things depending on context, such as:

• use
• uses
• will use

So ろくろを使う could mean things like:

• I use a wheel
• He uses a wheel
• We will use a wheel

Japanese does not force you to mark person or number the way English often does. Context tells you which meaning is intended.

Japanese very often omits the subject when it is already understood from context.

So instead of saying:

• 私はろくろを使う
• 彼はろくろを使う

Japanese can simply say:

• ろくろを使う

This does not mean the subject is missing by mistake. It just means Japanese expects the listener to figure it out from the situation.

Yes, but Japanese non-past forms cover both present and future.

So 使う can mean:

• a habitual action: uses
• a general action: use
• a future action: will use

Examples:

• 仕事でろくろを使う。 = I use a pottery wheel for work. / I will use a pottery wheel for work.

If you specifically want to say someone is using it right now, Japanese often uses 〜ている:

• ろくろを使っている。 = is using a pottery wheel

Although it is written を, the particle is pronounced お.

So ろくろを使う is pronounced roughly:

rokuro o tsukau

In romanization, you may see:

• rokuro o tsukau
• sometimes rokuro wo tsukau

But in actual pronunciation, it is basically o, not wo.

Yes, it can be written in kanji, but it is very often written in kana because the kanji are uncommon.

A possible kanji form is:

• 轆轤

Many learners do not need to memorize that kanji early on. Seeing ろくろ in hiragana is completely normal.

Yes, normal Japanese writing usually has no spaces.

So this would normally be written as:

ろくろを使う。

Spaces are often added in learning materials to make it easier to see the parts of the sentence:

• ろくろ
• を
• 使う

So the spaces are for teaching, not standard writing.

The polite form of 使う is 使います.

So the polite version is:

ろくろを使います。

Compare:

• ろくろを使う。 = plain / casual
• ろくろを使います。 = polite

You would use 使います in normal polite conversation, with strangers, teachers, customers, and so on.

The basic order here is the normal one:

ろくろを使う

Japanese does allow some flexibility, but the verb usually still comes at the end, and を still marks the object.

For a simple sentence like this, ろくろを使う is the most natural order.

You could also add a topic:

• 私はろくろを使う。 = I use a pottery wheel.
• 彼はろくろを使う。 = He uses a pottery wheel.

But the core pattern stays the same:

object + を + verb